TY - GEN A1 - Godsil, C. D. A1 - Grötschel, Martin A1 - Welsh, D. J. A. T1 - Combinatorics in Statistical Physics T3 - ZIB-Report - SC-91-19 Y1 - 1992 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-694 ER -