00290nam a2200121Ia 4500082001900000100001800019245002700037260003300064300001400097490004700111500000500158700000500163  a519.3bC767.ON  aConway, J. H.  aOn numbers and gamesb  aLondonbAcademic Pressc1976  aix, 238p.  aLondon Mathematical Society monographsv 6  a  a