J. Beck, Combinatorial games -Tic-tac-toe theory, volume 114 of Encyclopedia of Mathematics and its Applications, 2008.

E. R. Berlekamp, J. H. Conway, and R. K. Guy, Winning ways for your mathematical plays, 2003.

J. H. Conway, On numbers and games. A K Peters Ltd, 2001.

E. Janvresse, CNRS ? Avenue de l'Université ? 76801 SaintÉtienneSaint´SaintÉtienne du Rouvray, France. E-mail address: Elise