1. The complexity of checkers on an n × n board—preliminary report;Fraenkel,1978
2. Computers and Intractability: A Guide to the Theory of NP-Completeness;Garey,1979
3. Go is polynomial-space hard;Lichtenstein;J. Assoc. Comput. Mach.,1980
4. Proceedings, 19th Annual Symposium on Foundations of Computer Science, Ann Arbor, Mich., October 1978;Lichtenstein,1978
5. Official Rules of Chess,1978