The Categories of Yetter - Drinfel'd Modules, Doi - Hopf Modules and Two-sided Two-cosided Hopf Modules. - M. Beattie; S. Dascalescu; Serban Raianu; Freddy Van Oystaeyen (Appl. Categorical Struct., 1998)

Duality for Finite Hopf Algebras Explained by Corings. - Stefaan Caenepeel; Declan Quinn; Serban Raianu (Appl. Categorical Struct., 2006)