Fuzzy soft positive implicative hyper BCK-ideals in hyper BCK-algebras. - Somayeh Khademan; Mohammad Mehdi Zahedi; Young Bae Jun; Rajab Ali Borzooei (J. Intell. Fuzzy Syst., 2019)

Double-Framed Soft Set Theory Applied to Hyper BCK-Algebras. - Hashem Bordbar; Somayeh Khademan; Rajab Ali Borzooei; Mohammad Mehdi Zahedi; Young Bae Jun (New Math. Nat. Comput., 2021)