Subalgebras and Ideals in BCK/BCI-algebras Based on Uni-hesitant Fuzzy Set Theory. Eur. J. Pure Appl. Math. [Internet]. 2018 Apr. 27 [cited 2024 Dec. 22];11(2):417-30. Available from: https://www.ejpam.com/index.php/ejpam/article/view/3246