| 2016-10 | Fundamental stabilities of the nonic functional equation in intuitionistic fuzzy normed spaces | 박춘길 |
| 2012-10 | Further Results on Derivations of Ranked Bigroupoids | 김희식 |
| 2011-11 | Fuzzy *-homomorphisms and fuzzy *-derivations in induced fuzzy C*-algebras | 박춘길 |
| 2015-11 | FUZZY APPROXIMATE OF DERIVATIONS | 박춘길 |
| 2012-06 | Fuzzy approximate of homomorphisms | 박춘길 |
| 2019-05 | Fuzzy filters of hoops based on fuzzy points | 김희식 |
| 2011-02 | FUZZY FUNCTIONAL INEQUALITIES | 박춘길 |
| 2019-03 | Fuzzy Hyers-Ulam stability for generalized additive functional equations | 박춘길 |
| 2015-07 | Fuzzy logical algebras and their applications | 김희식 |
| 2012-04 | Fuzzy n-Jordan *-homomorphisms in induced fuzzy C*-algebras | 박춘길 |
| 2020-09 | Fuzzy normed spaces and stability of a generalized quadratic functional equation | 박춘길 |
| 2016-10 | Fuzzy rank functions in the set of all binary systems | 김희식 |
| 2011-05 | FUZZY STABILITY OF A CUBIC-QUARTIC FUNCTIONAL EQUATION: A FIXED POINT APPROACH | 박춘길 |
| 2011-10 | FUZZY STABILITY OF A FUNCTIONAL EQUATION RELATED TO INNER PRODUCT SPACES | 박춘길 |
| 2015-06 | FUZZY STABILITY OF FUNCTIONAL EQUATIONS IN MATRIX FUZZY NORMED SPACES | 박춘길 |
| 2015-07 | Fuzzy stability of functional equations in n-variable fuzzy Banach spaces | 박춘길 |
| 2013-05 | Fuzzy stability of functional inequalities in matrix fuzzy normed spaces | 박춘길 |
| 2011-10 | Fuzzy Stability of Generalized Mixed Type Cubic, Quadratic, and Additive Functional Equation | 박춘길 |
| 2011-09 | Fuzzy-Fated Filters of R-0-Algebras | 김희식 |
| 2019-09 | A general functional equation | 박춘길 |
