About the fundamental relations defined on the hypergroupoids associated with binary relations. - Irina Cristea; Mirela Stefanescu; Carmen Angheluta (Eur. J. Comb., 2011)

On Atanassov's Intuitionistic Fuzzy Grade of Complete Hypergroups. - Carmen Angheluta; Irina Cristea (J. Multiple Valued Log. Soft Comput., 2012)