Ulrich Faigle Sándor P. Fekete Winfried Hochstättler Walter Kern The Nucleon of Cooperative Games and an Algorithm for Matching Games Electronic Colloquium on Computational Complexity (ECCC) 1995 7 2 db/journals/eccc/eccc2.html#ECCC-TR95-007 http://eccc.hpi-web.de/eccc-reports/1995/TR95-007/index.html