Searching for spaceships

David Eppstein
More Games of No Chance, MSRI Publications 42, Richard J. Nowakowski, ed., Cambridge Univ. Press, 2002, pp. 433–453
ACM Computing Research Repository, cs.AI/0004003
Mathematical Reviews 2004b:91044
http://www.msri.org/publications/books/Book42/files/eppstein.pdf

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