Fuzzy multiply positive implicative hyper BCK-ideals of hyper BCK-algebras. - Jianming Zhan 001; Dajing Xiang; Zhisong Tan (Int. J. Math. Math. Sci., 2004)

Generalizations of principally quasi-injective modules and quasiprincipally injective modules. - Zhanmin Zhu; Zhangsheng Xia; Zhisong Tan (Int. J. Math. Math. Sci., 2005)