The (-1)-critically duo-free tournaments. - Mohamed Baka Elayech; Abdeljelil Salhi; Hamza Si Kaddour (Ars Comb., 2015)

Critically Twin Primitive 2-Structures. - Youssef Boudabbous; Pierre Ille; Bertrand Jouve; Abdeljelil Salhi (Graphs Comb., 2015)

Minimal Duo-free Digraphs for One or Two Vertices. - Nesrine Azizi; Imed Boudabbous; Abdeljelil Salhi (J. Multiple Valued Log. Soft Comput., 2022)