Affiliation: | 1. Angewandte Geometrie und Geometrische EDV, Technische Universit?t Braunschweig, D-3300, Braunschweig, West Germany 2. Mathematical Science Department, Thomas J. Watson Research Center, 10598, Yorktown Heights, New York, USA 3. Department of Mathematics, University of Utah, 84112, Salt Lake City, Utah, USA
|