JUN, Y. B.; ROH, E. H.; SONG, S. Z. Commutative Energetic Subsets of BCK-Algebras. Bulletin of the Section of Logic, [S. l.], v. 45, n. 1, p. 53–63, 2016. DOI: 10.18778/0138-0680.45.1.04. Disponível em: https://czasopisma.uni.lodz.pl/bulletin/article/view/1477. Acesso em: 7 may. 2024.