The class of groups which have a subgroup of index 2 is not elementary. - Thierry Coulbois (Arch. Math. Log., 2001)

Free Product, Profinite Topology and Finitely Generated Subgroups. - Thierry Coulbois (Int. J. Algebra Comput., 2001)

Aperiodic monotiles: from geometry to groups. - Thierry Coulbois; Anahí Gajardo; Pierre Guillon 001; Victor H. Lutfalla (CoRR, 2024)