Authors: Coulbois, T

Citation: T. Coulbois, The class of groups which have a subgroup of index 2 is not elementary, ARCH MATH L, 40(7), 2001, pp. 523-524

Authors: Coulbois, T Khelif, A

Citation: T. Coulbois et A. Khelif, Equations in free groups are not finitely approximable, P AM MATH S, 127(4), 1999, pp. 963-965