𝒩 -subalgebras in BCK/BCI-algebras based on point 𝒩 -structures. Jun, Young Bae; Kang, Min Su; Park, Chul Hwan — 2010 International Journal of Mathematics and Mathematical Sciences
Positive implicative ideals of BCK-algebras based on a soft set theory. Jun, Young Bae; Kim, Hee Sik; Park, Chul Hwan — 2011 Bulletin of the Malaysian Mathematical Sciences Society. Second Series
Implicative ideals of BCK-algebras based on the fuzzy sets and the theory of falling shadows. Jun, Young Bae; Kang, Min Su; Park, Chul Hwan — 2010 International Journal of Mathematics and Mathematical Sciences