Affiliation: | 1. Columbia University, 10027, New York, NY, USA 2. Department of Mathematics, Michigan State University, 48824, East Lansing, MI, USA 3. Gesellschaft für Mathematik und Datenverarbeitung, P.O. Box 1240, W-5205, St. Augustin 1, Federal Republic of Germany 4. Department of Computer Science, Stanford University, 94305-2140, Stanford, CA, USA 5. Department of Mathematics, McMaster University, L8S 4K1, Hamilton, Ontario, Canada
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