The Direction Entropies for Intuitionistic Fuzzy Sets. - Qin-peng Cai; Juan Li; Chengyi Zhang (ACFIE, 2008)

The Continuity of Complex Fuzzy Function. - Qin-peng Cai (ICFIE, 2009)

Some Correlative Conception and Properties of Bounded Closed Fuzzy Complex Number Set. - Sheng-Quan Ma; Qin-peng Cai; De-jun Peng (ICFIE, 2009)