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Northeastern University Boston, MA 02115 Dept. of Mathematics Boston University Boston, Massachussetts 02215 Dept. of Mathematics University of Mass. at Boston Boston, Massachussetts 02125 Department of Mathematics University of Colorado Campus Box 426 Boulder, Colorado 80309 Dept. Math. Western Kentucky University Bowling Green, Kentucky 42101 Dept. of Math & Stats. Bowling Green State Univ. Bowling Green, OH 43403 Fac. of Mathematics and Physics Comenius University 842 15 Bratislava SLOVAKIA Department of Mathematics Masaryk University Janackovo nam. 2a 662 95 Brno CZECH REPUBLIC Mathematical Institute of Hungarian Academy of Sciences P.O. Box 127 H-1364 Budapest HUNGARY Mathematical Institute Hungarian Academy of Sciences Realtanoda U. 13 - 15 Budapest V. HUNGARY Department of Mathematics Canisius College Buffalo, NY 14208 Dep. de mathematiques I.H.E.S. 35, route de Chartres F-91440 Bures-sur-Yvette FRANCE Dept. of Mathematics University of Vermont Burlington, Vermont 05401 Dept. of Mathematics Simon Fraser University Burnaby (British Columbia) Canada V5A 1S6 Departement de Mathematiques Pures Universite de Caen Esplanade de la Paix F-14000 Caen FRANCE Dipartimento di Mathematica Universita di Cagliari Via Ospedale 72 I-09124 Cagliari ITALIE Department of Mathematics and Statistics University of Calgary 2500 University Drive Calgary Alberta CANADA T2N 1N4 Department of Mathematics Harvard University 1, Oxford St. Cambridge, MA 02138 Department of Mathematics,Room 2-342 M.I.T. 77 Massachusetts Ave. Cambridge, MA 02139 School of Maths & Stats University of Sydney Carslaw Building, F07 NSW 2006 Camperdown AUSTRALIA Department of Mathematics University of North Carolina Chapel Hill, NC 27599 Dept. of Mathematics College of Charleston Charleston, SC 29424 Dept. Math. University of Virginia Charlottesville, VA 22903 Dept. of Math. Stat. & Comp. Sc. University of Illinois at Chicago Box 4348 Chicago, IL 60680 Dept. of Mathematics Chicago State University Chicago, Illinois 60628 Departement de Mathematiques Universite du Quebec e Chicoutimi 555, boul. de l'Universite Chicoutimi (Quebec) CANADA G7H 2B1 Dept. of Mathematics University of Cincinnati Cincinnati, OH 45267 Departement de mathematiques Universite de Clermont-Ferrand 1 34 ave. Carnot, B.P. l85 F-63006 Clermont-Ferrand FRANCE Department of Mathematics and Statistics Case Western Reserve University Cleveland, OH 44106 Dept. of Mathematics Cleveland State University Cleveland, OH 44115 Dept. of Mathematics University of Maryland College Park, Maryland 20742 Department of Mathematics and Statistics University of South Carolina Colombia, SC 29208 Dept. of Mathematics University of Colorado Colorado Springs, Colorado 80907 Dept. of Math University of Missouri Columbia, MO 65211 Department of Mathematics The Ohio State University 231 West 18th Avenue Columbus, OH 43210 Dept. of Math Flanklin Univ. 201 S Grant Ave Columbus, OH 43215-5301 Institute of Math. Statistics Univ. of Copenhagen Universitatsparken DK-2100 Copenhagen 0 DENMARK Dept. of Math University of Miami Box 249085 Coral Gables, FL 33124-9085 Math.-Inform. Ingenieurhochschule Cottbus Leistikowstrasse 15 75 Cottbus GERMANY Mathematics Institute University of Warwick Coventry ENGLAND CV4 7AL Fachbereich Mathematik Technische Hochschule Darmstadt Schlossgartenstr. 7 D-6100 Darmstadt GERMANY Dept. of Mathematics University of California Davis, CA 95616 Dept. of Math & Stat Wright State University Dayton, OH 45435 Dept. of Math Northern Illinois University DeKalb, IL 60115 Dept. of Mathematics North Texas State University Denton, Texas 76203 Dept. of Mathematics University of Denver Denver, Colorado 80208 Dept. of Math & Comp Sci Drake University Des Moines, IA 50311-4522 Department of Mathematics Wayne State University Detroit, MI 48202 Dept. of Mathematics York University Downsview (Ontario) CANADA M3J 1P3 Department of Mathematics University of Otago Dunedin NEW ZEALAND Department of Mathematics Duke University Durham, NC 27706 Dept. of Mathematics University of New Hampshire Durham, New Hampshire 03824 Dept. of Mathematics Michigan State Un. Wells Hall East Lansing, MI 48824-1027 Department of Mathematics University of Alberta Edmonton Alberta CANADA AB T6G 2G1 Dept. of Mathematics University of Texas at El Paso El Paso, Texas 79968 Mathematisches Institut Universitat Erlangen Bismarckstr. 1 1/2 D-8520 Erlangen GERMANY Dept. of Mathematics University of Oregon Eugene, Oregon 97403 Department of Mathematics Northwestern University Evanston, IL 60201 Dept. of Math. North Dakota State Un. Fargo, ND 58105-5075 Dept. of Mathematics Colorado State University Fort Collins, CO 80523 Dept. of Math Sciences Indiana Univ.-Purdue Univ Fort Wayne, IN 46805 Fachbereich Mathematik Der Johann Wolfgang Goethe-Universitat Robert-Mayer-Strass 10 D-6000 Frankfurt Am Main 1 GERMANY Dept. of Mathematics and stat. University of New Brunswick Fredericton (New Brunswick) CANADA E3B 5A3 Department of Mathematics University of Florida 201 Walker Hall Gainsville, FL 3261 Section de Mathematiques Universite de Geneva CP 240 CH-1211 Geneva 24 SWITZERLAND Dept. of Mathematics University of North Dakota Grand Forks, North Dakota 58202 Department of Mathematics Furman University Greenville, SC 29613 Dep. de mathematiques Universite de Grenoble I B.P. 53 Centre de TRI F-38041 Grenoble Cedex FRANCE Dep. de mathematiques Universite de Grenoble II F-38040 Grenoble Cedex FRANCE Dept. of Mathematics University of Groningen P.O. Box 800 9700 Groningen NETHERLANDS Dept. of Mathematics Dalhousie University Halifax (Nova Scottia) CANADA B3H 4H8 Mathematisches Seminar Universitat Hamburg Bundesstr. 55 2000 Hamburg 13 GERMANY Department of Mathematics University of Waikato Hamilton NEW ZEALAND Department of Mathematics and Statistics McMaster University Hamilton (Ontario) CANADA L8S 4K1 Department of Mathematics Purdue University Hammond, IN 46323 Dept. of Mathematics & Comp. Sci. Dartmouth College Hanover, NH 03755 Department of Mathematics Haverford College Haverford, PA 19041 Dept. of Mathematics University of Hawaii Honolulu, Hawaii 96822 Dept. of Mathematics and Computer Science Michigan Technical University Houghton, MI 49931 Dept. of Mathematics University of Houston Houston, TX 77004 Dept. of Math. Sci. Rice University P.O. Box 1892 Houston, TX 77251-1892 Dept Applied Math National Chiao-Tung Univ Hsin-Chu CHINA Taiwan Institut fur Mathematik TH Ilmenau Postschliessfach 327 O-6300 Ilmenau AUSTRIA Dept. of Mathematics Indiana University of Pennsylvania Indiana, Pennsylvania 15701 Dept. of Mathematical Sciences Indiana-Purdue University Indianapolis, Indiana 46202 Institut fur Mathematik Universitat Innsbruck Technikerstrasse 25 A-6020 Innsbruck AUSTRIA Department of Mathematics University of Iowa Iowa City, IA 52242 Dept. of Mathematics University of California Irvine, CA 92717 Dept. of Math Isfahen Univ of Tech Isfahan IRAN Dept. of Mathematics Cornell University White Hall Ithaca, NY 14853-7901 Institute of Mathematics and Computer Science Hebrew University of Jerusalem Givat Ram Jerusalem ISRAEL Dept of Comp & Applied Math University of Wiwaterstrand 1 Jan Smuts Ave 2050 Johannesburg Rep of South Africa Dept of Mathematics University of Missouri-Kansas CI Kansas City, Missouri 64110 Mathematics Discipline University of Wisconsin-Parkside Kenosha, WI 53141 Dept. of Mathematical Sciences Kent State University Kent, OH 44242 Dept. of Mathematics Queen's University Kingston (Ontario) CANADA Departement of Mathematics Royal Military College Kingston (Ontario) CANADA K7L 2W3 Dept. of Mathematics University of Rhode Islands Kingston, Rhode Island 02881 Mathematisches Institut Universitat zu Koln Weyertal 86--90 D-5000 Koln 41 GERMANY Fakultat fur Mathematik Universitat Konstanz Postfach 5560 D-7750 Konstanz GERMANY Department of Mathemaics University of California at San Diego La Jolla La Jolla, CA 92093 Dept. of Mathematics and Stat. University of Southwest Louisiana Lafayette, Louisiana 70504 Dept. Math. University of Wyoming Laramie, WY 82071 Institut fur Mathematik und angewandte Geometrie Montan universitat Leoben Franz-Josef-Str. 18 A-8700 Leoben AUSTRIA Dept of Math University of Kentucky 715 Pot Lexington, KY 40506-0027 Department of Math. and Statistics University of Nebraska Lincoln, NE 68588 - 0323 Institut fur Mathematik-RISC Universitat Linz A-4040 Linz AUSTRIA Dept of Mathematics Utah State University Logan, UT 84322 Mathematics Department North East London Polytechnic Romford Rd, Stratford London UNITED KINGDOM E15 4IZ School of Mathematical Sciences Queen Mary College Mile End Road London UNITED KINGDOM E1 4N Dep. of Mathematics University College London Gower Street London ENGLAND WC1 6BT Dept. of Mathematics University of Western Ontario London (Ontario) CANADA N6A 5B9 Department of Mathematics University of Southern California Los Angeles, CA 90007 Dept. of Math & Comp Sci California State University Los Angeles, CA 90032 Dept. of Math University of Louisville Louisville, KY 40292 Departement de mathematiques Universite Claude Bernard 86 rue Pasteur F-69365 Lyon Cedex FRANCE Department of Mathematics Western Illinois University Macomb, IL 61455 Dept. of Math. Un. of Wisconsin 480 Lincoln Drive Madison, WI 53706 Department of Mathematics Indian Institute of Technology 600036 Madras INDIA Dept. of Mathematics Kansas State University Manhattan, Kansas 66506 Departement de mathematiques Universite de Provence Place Victor Hugo F-13331 Marseille Cedex 3 FRANCE Department of Mathematics and Computer Sciences Technological University P.O. Box 513 NL-5600 Mb Eindhoven NETHERLANDS Dept. of Mathematical Sci. Memphis State Un. Memphis, TN 38152 Dept. of Mathematics Universidad Autonoma Metropolitana Apartado 55-534 09340 Mexico D.F. MEXICO Dept. of Mathematics Wesleyan Univ Middletown, CT 06457 Dept. of Mathematical Sciences Pennsylvania State University Capital Campus Middletown, Pennsylvania 17057 Dept. of Mathematics University of Wisconsin-Milwauke Milwaukee, Wisconsin 53201 Department of Mathematics University of Minnesota Minneapolis, MN 55455 Dept. of Mathematical Sciences University of Montana Missoula, Montana 59812 Departement de Mathematique Universite de l'tat e Mons 15 Avenue Maistriau B-7000 Mons BELGIUM Dep. de mathematiques appliquees Universite Paul Valery Place de la Voie Domitienne F-34032 Montpellier Cedex FRANCE Departement de mathematiques CEGEP Vieux-Montreal C.P. 1444, Succ. N Montreal (Quebec) CANADA H2X 3M8 Dept. of Mathematics Concordia University 1455 boul. de Maisonneuve O. Montreal (Quebec) CANADA H3G 1M8 Dept. of Math & Stat McGill University Burnside Hall, 805 Sherbrooke Montreal (Quebec) CANADA H3A 2K Departement de Mathematiques Universite Concordia (Campus Loyola) 7141 Sherbrooke ouest Montreal (Quebec) CANADA H4B 1R Departement de Math. & Stat. Universite de Montreal C.P. 6128, Succ A Montreal (Quebec) CANADA H3C 3J7 Dept. de mathematiques et d'informatique Universite du Quebec e Montreal C.P. 8888, Succ. A Quebec H3C 3P8 CANADA Department of Mathematics West Virginia University Morgantown , West Virginia 2650 Inst. of App. Math. of Academy of Science of Russia Minsskaya Square 4 125047 Moscow RUSSIE Dept. of Mathematics University of Idaho Moscow, Idaho 83843 Faculte des Sc. et Tech., Labor. de Mathematiques Universite de Haute-Alsace 4, rue des Freres Lumiere F-68093 Mulhouse Cedex FRANCE Departement de mathematiques Universite du Haut-Rhin 61 rue Albert Camus F-68093 Mulhouse Cedex FRANCE Mathematisches Institut TU Munchen Postfach 202420 D-8000 Munchen 2 GERMANY Dept. Math. Nagoya University 464-01 Nagoya JAPAN 464-01 JAPAN Institut de Mathematiques et Informatique Universite de Nantes 2, Chemin de la Houssiniere F-44072 Nantes FRANCE Departement de mathematiques Universite de Nantes 1 Quai de Tourville B.P. 1026 F-44035 Nantes Cedex FRANCE Dept. of Mathematics Vanderbilt University Nashville, Tennessee 37235 Department of Mathematics Indian Institute of Technology 110016 New Delhi INDIA Dept. of Mathematics Yale University New Haven, CT 06520 Dept. of Mathematics Tulane University New Orleans, Louisiana 70118 Dept. of Mathematics University of New Orleans New Orleans, Louisiana 70122 Dept. of Mathematics Un. of Newcastle 2308 New South Wales AUSTRALIA Dept of Mathematics Columbia University New York, New York 10027 Dept. of Mathematics New York University New York, New York 10012 Department of Mathematics City College CUNY New York, NY 10031 Dept. of Mathematics Rockerfeller Univ. New York, NY 10021 Department of Mathematics Rutgers University New-Brunswick, NJ 08903 Departement de Mathematiques Universite de Nice Parc Valrose F-06034 Nice Cedex FRANCE Dept. of Mathematics University of Oklahoma Norman, Oklahoma 73019 Department of Mathematics University College of North Wales North Wales UNITED KINGDOM Department of Mathematics and Statistics York University North York (Ontario) CANADA M3J 1P Dept. of Mathematics Smith College Northampton, MA 01063 Dept. Math. St. Olaf College Northfield, MN 55054 Dept of Math Wheaton college Norton, MA 02766 Dept. of Mathematics University of Notre Dame Notre Dame, IN 46556 FB6 Mathematik Universitat Oldenburg Postfach 25 03 D-2900 Oldenburg GERMANY Dept. of Mathematics and Comp. Science University of Nebraska at Omaha Omaha, NE 68182 Dept. of Math University of Maine 333 Neville Hall Orono, ME 04469 Departement de mathematiques Universite Paris-Sud Centre d'Orsay F-91405 Orsay FRANCE Dept. of math. SUNY College Oswego Oswego, NY 13126 Dept of Mathematics and Statistics Carleton University Ottawa (Ontario) CANADA K1S 5B6 Departement of Mathematics University of Ottawa Ottawa (Ontario) CANADA K1N 9B4 Dept of Math & Stat Miami University Oxford, OH 45056 Centre de mathematiques purs Ecole Polytechnique Route de Palaiseau 78128 Palaiseau FRANCE Dept. of Mathematics University of Athens 15781 Panepistemiopolis GREECE Departement de mathematiques College de France 11 Place Marcelin-Barthelot F-75005 Paris FRANCE Sciences mathematiques Ecole des hautes etudes 11 Pierre Curie Paris FRANCE Centre de Mathematiques Ecole Normale Superieure 45, rue d'Ulm F-75014 Paris FRANCE Departement de mathematiques Universite de Paris IX Place du Marechal de Lattre F-75016 Paris FRANCE Departement de mathematiques Universite de Paris I 12 Place du Pantheon F-75231 Paris Cedex 05 FRANCE Departement de mathematiques Universite de Paris VII 2 Place Jussieu F-75221 Paris Cedex 05 FRANCE Inst. de mathematiques appliquees Universite de Paris VI 4 Place Jussieu F-75230 Paris Cedex O5 FRANCE Department of Mathematics University of Melbourne Parkville AUSTRALIA VIC. 3052 Department of Mathematics California Institute of Technology Pasadena, CA 91125 Department of Mathematics Unviersity of Patras Patras GREECE Department of Mathematics Temple University Philadelphia, PA 19122 Departement of Mathematics University of Pennsylvania Philadelphia, PA 19104 Math. Dept. Drexel University Philadelphie, PA 19104 Dept. of Mathematics Carnegie-Mellon University Pittsburgh, PA 15213 Dept. of Mathematics and Stats. University of Pittsburgh Pittsburgh, Pennsylvania 15260 Sektion Mathematik der Humboldt-Universitat zu Berlin Unter den Linden 6 1086 BERLIN Po Box 1297 Dept. of Math Pohang Inst of Sci & tech P O Box 125 790 Pohang South Korea Dept. of Math Lewis & Clark College Portland, OR 97219 Div. of Math. Physics, Inst. of Physic Adam Mickiewicz University u. Jana Matejki 48/49 60-769 Poznan POLAND Department of Mathematics Princeton University Princeton, NJ 08544 Dept. of Mathematics Brown University Providence, RI 02912 Dept. of Math Brigham Young University Provo, UT 84602 Department of Pure and Applied Math. Washington State Univeristy Pullman, WA 99164-2930 Department of Mathematics & Statistics University of Regina Regina (Saskatchewan) CANADA S4S 0A2 Department of Theoretical Mathematics The Weizmann Institute of Science 76100 Rehovot ISRAEL Departement de mathematiques Universite de Rennes I 2 rue du Thabor B.P. 829 F-35010 Rennes Cedex FRANCE Dept. of Mathematics University of Puerto Rico Rio Piedras, Puerto Rico 00931 Department of Mathematics University of California at Riverside Riverside, CA 92521 Dept. Math. Oakland University Rochester, MI 48309 Dept of Mathematics University of Rochester Rochester, New York 14620 Mathematics Institute Universite de Rome Via Vicenza 23 Rome ITALIE Dept of Mathematics Mount Allison University Sackville (New Brunswick) CANADA E0A 3C0 Dept. of Math. Sci. College of Engineering University of Osaka Prefecture 591 Sakai, Osaka JAPAN Dept. of Mathematics University of Utah Salt Lake City, Utah 84112 Institut fur Mathematik Universitat Salzburg Hellbrunnerstrasse 34 A-5020 Salzburg AUSTRIA Dept. of Mathematics, comp. science University of Texas at San Antonio San Antonio, Texas 78285 Dept. of Mathematics San Diego State Uni. San Diego, CA 92182-0314 Dept of Mathematics University of San Francisco San Francisco, CA 94117 Department of Mathematics San Jose State Unviersity San Jose, CA 95114 Departement of Mathematics Cal. Poly State University San Luis Obispo, CA 93407 Dept. of Mathematics University of California Santa Barbara, CA 93106 Dept. of Mathematics Santa Clara University Santa Clara, CA 95053 Dept Math & comp. Sci. Skidmore College Saratoga Spring, NY 12866 Department of Mathematics University of Saskatchewan Saskatoon (Saskatchewan) CANADA S7N 0W0 Department of Mathematics University of Washington Seattle, WA 98195 Dept. of Mathematics Seoul National Un. Shinlim-Donb, Kwanak-Gu Seoul SOUTH KOREA Departement de Mathematiques Universite de Sherbrooke 2500, boul Universite Sherbrooke (Quebec) CANADA J1K 2R1 Dept. of Maths and Stats College of Sciences Shiraz University 51454 Shiraz IRAN Lehrstuhl fur Mathematik I Universitat Siegen Holderlinstrasse 3 D-5900 Siegen GERMANY Department of Mathematics National University of Singapore Kent Ridge 0 511 Singapor SINGAPOUR Dept of Math & Comp Sci Indiana Univ of South Bend P O Box 7111 South Bend, IN 46617 Department of Mathematics Mount Holyoke College South Hadley, MA 01075 Dept. Math. University of Southampton Southampton ENGLAND SO9 5NH Department of Mathematics The University of West Indies St Augustine TRINIDAD Dept of Mathematics St Cloud State University St Cloud, MN 56304 Dept. of Mathematics and Statistics Memorial University of Newfoundland St. Johns (Newfoundland) CANADA A1B 3X7 Dept of Mathematics Washington University St. Louis, Missouri 63130 Departement de Mathematiques College Militaire Royal de St-Jean St-Jean-sur-Richelieu (Quebec) CANADA J0J 1R0 Dept of Mathematics Stanford University Stanford, CA 94305 Dept of Mathematics and physics Arkansas State University State University, Arkansas 72467 Departement de Mathematiques Universite Laval Cite Universitaire Ste-Foy (Quebec) CANADA G1K 7P4 Dept. of Mathematics Royal Institute of Technology S-100-44 Stockholm SUéDE Department of Mathematics University of Stockholm Box 6701 S-11385 Stockholm SWEDEN Mathematics Department SUNY at Stony Department Stony Brook, NY 11794 Dept of Mathematics University of Connecticut Storrs, Connecticut 06268 Departement de mathematiques Universite de Strasbourg 7, rue Rene Descartes F-67084 Strasbourg FRANCE Dept of Mathematics Laurentian University Sudbury (Ontario) CANADA P3E 2C6 Dept of Math Swarthmore College 500 College Ave Swarthmore, PA 19081-1397 Dept of Mathematics Syracuse University Syracuse, New York 13210 Institute of Applied Mathematics National Chung-Hsing University R.O.C. Taichug TAIWAN UER Mathematiques et Informatique Universite Bodreaux I 351, cours de la Liberation 33405 Talence Cedex FRANCE Department of Mathematics Tel Aviv University Tel Aviv Ramat Aviv Tel Aviv ISRAEL 61391 Dept. of Math. Arizona State University Tempe, Arizona 85287-1804 Dept of Math. Science University of Tokyo Hongo 7-3-1 Bunkyo-Ku 113 Tokyo JAPAN Dept of Mathematics University of Toledo Toledo, Ohio 43606 Department of Mathematics University of Toronto Toronto (Ontario) CANADA M5S 1A4 Dept. of Math., Physics & Comp. Sci. Ryerson Polytechnical Institute 350 Victoriat Street Toronto (Ontario) CANADA M5B 2K3 Departement de mathematiques Universite de Toulouse II 109 bis rue de Vauquelin F-31081 Toulouse Cedex FRANCE Departement de mathematiques Universite Paul Sabbatier 118 Route de Narbonne F-31077 Toulouse Cedex FRANCE Fb IV, Mathematik Universitat Trier Postfach 3825 5500 Trier GERMANY Departement de Mathematiques Universite du Quebec e Trois-Rivieres 3351, boul. des Forges, C.P. 500 Trois-rivieres (Quebec) CANADA G9A 5H7 Dept of Mathematics University of Arizona Tucson, Arizona 85721 Department of Mathematics Pennsylvania State University 215 Mc Allister Bldg University Park, PA 16802 Dept of Math University of Illinois 1409 W. Green Street Urbana, IL 61801-1637 Departement de Mathematiques Universite de Valenciennes Le Mont Houy F-59326 Valenciennes CEDEX FRANCE Mathematics department University of British Columbia 121-1984 Mathematics Road Vancouver (BC) CANADA V6T 1Y4 Dipt de Math Ctr Etudes de Limeil Volenton BP 27 94190 Villeneure St Georges FRANCE Departement de mathematiques Universite de Lille I B. P. 36 F-59650 Villeneuve d'Ascq FRANCE Lab. d'Algebre Ordinale 101/Dept. Math. Univ. Claude Bernard Lyon I 43, Boulevard du 11 Novembre 1918 F-69622 Villeurbanne Cedex FRANCE Department of Mathematics Brandeis University P.O. Box 9110 Waltham, MA 02254 Department of Mathematics Howard University Washington, D.C 20059 Department of Mathematics George Washington University Washington, DC 20052 Department of Mathematics University of Waterloo Waterloo (Ontario) CANADA N2L 3G1 Dept. Math. Wellesley College Wellesley, MA 02181 Dept of Mathematics Purdue University West Lafayette, IN Dept of Mathematics Regis College 235 Wellesley St Weston, MA 02193-1571 Institut fur Algebra und Diskrete Mathematik der Technischen Universitat Wien Gushausstrase 27-29 A-1040 Wien AUSTRIA Institut fur Diskrete Mathematik (118.4) Technische Universitat Wiedner Hauptstrasse 8--10 A-1200 Wien AUSTRIA Institut fur Mathematik Universitat Wien Strudlhofgasse 4 A-1090 Wien AUSTRIA Department of Mathematics and Statistics University of Windsor Windsor (Ontario) CANADA N9B 3P4 Dept of Mathematics and Astronomy University of Manitoba Winnipeg (Manitoba) CANADA R3T 2N2 Department of Mathematics University of Winnipeg 515 Portage Ave. Winnipeg (Manitoba) CANADA R3B 2E9 Department of Mathematics Wake Forest University Winston-Salem, NC 27109 Dept. of Math and C. S. Wake Forest University Winston-Salem, NC 27109 Dept. of Applied Math. Gifu University 501-11 Yanagido, Gifu JAPAN Department of Mathematics Eastern Michigan University Ypsilanti, Michigan 48197 Department of Mathematics University of Zagreb PP 187 41000 Zagreb CROATIA Inst. Angew Math. Univ. Zurich Raemist 74 CH-8001 Zurich SWITZERLAND