MUHIUDDIN, G.; ALDHAFEERI, S.; SHUM, K. P. \((\varepsilon,\delta)\)-Characteristic Fuzzy Sets Approach to the Ideal Theory of \(BCK/BCI\)-Algebras. Journal of Informatics and Mathematical Sciences, [S. l.], v. 10, n. 4, p. 573–581, 2018. DOI: 10.26713/jims.v10i4.1130. Disponível em: https://www.rgnpublications.com/journals/index.php/jims/article/view/1130. Acesso em: 2 may. 2024.