Jung Mi Ko, Young Hie Kim, and Sun Shin Ahn. “Permeable Values With Applications in BE-Algebras”. Journal of Computational Analysis and Applications (JoCAAA) 29, no. 5 (October 18, 2021): 902–909. Accessed September 1, 2024. http://eudoxuspress.com/index.php/pub/article/view/201.