XIN, Xiao Long; JUN, Young Bae. POSITIVE IMPLICATIVE ENERGETIC SUBSETS OF BCK-ALGEBRAS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 37, p. 607–614, 2017. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6772. Acesso em: 16 sep. 2026.