A note on Hacque's cohomology of rings-groups and extensions of rings-groups by groups. M. Bullejos — 1996 Extracta Mathematicae
Homotopy colimits and cohomology with local coefficients M. Bullejos; E. Faro; M. A. García-Muñoz — 2003 Cahiers de Topologie et Géométrie Différentielle Catégoriques