Author: Qin, Keyun

Zhang, Xiaohong; Qin, Keyun; Dudek, Wiesław A.: Ultra $LI$-Ideals in lattice implication algebras and $MTL$-algebras. (English). Czechoslovak Mathematical Journal, vol. 57 (2007), issue 2, pp. 591-605
Qin, Keyun; Xu, Yang; Jun, Young Bae: Ultra $LI$-ideals in lattice implication algebras. (English). Czechoslovak Mathematical Journal, vol. 52 (2002), issue 3, pp. 463-468

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