Intuitionistic Fuzzy Weak Congruences on a Semiring. - Kul Hur; Su Youn Jang; Keon-Chang Lee (Int. J. Fuzzy Log. Intell. Syst., 2006)

A New Approach to Fuzzy Congruences. - Kul Hur; Su Youn Jang; Keon-Chang Lee (Int. J. Fuzzy Log. Intell. Syst., 2007)

Intuitionistic Fuzzy G-Equivalence Relations and G-Congruences on a Groupoid. - Kul Hur; Keon-Chang Lee; Pyung-Ki Lim (Int. J. Fuzzy Log. Intell. Syst., 2008)

Fuzzy Equivalence Relations and Fuzzy Functions. - Keon-Chang Lee (Int. J. Fuzzy Log. Intell. Syst., 2009)

Interval-Valued H-Fuzzy Sets. - Keon-Chang Lee; Jeonggon Lee; Kul Hur (Int. J. Fuzzy Log. Intell. Syst., 2010)

Interval-Valued Fuzzy Ideals of a Ring. - Keon-Chang Lee; Kul Hur; Pyung-Ki Lim (Int. J. Fuzzy Log. Intell. Syst., 2012)