Projectivity and flatness over the colour endomorphism ring of a finitely generated graded comodule. Guédénon, T. — 2010 Beiträge zur Algebra und Geometrie
Projectivity and flatness over the endomorphism ring of a finitely generated comodule. Guédénon, T. — 2008 Beiträge zur Algebra und Geometrie
Projectivity and flatness over the endomorphism ring of a finitely generated module. Caenepeel, S.; Guédénon, T. — 2004 International Journal of Mathematics and Mathematical Sciences