HASHEM BORDBAR; XIAO LONG XIN; RAJAB ALI BORZOOEI; YOUNG BAE JUN. Positive implicative ideals of BCK-algebras based on neutrosophic sets and falling shadows. Neutrosophic Sets and Systems, [S. l.], v. 48, p. 9–30, 2022. Disponível em: https://fs.unm.edu/nss8/index.php/111/article/view/4159.. Acesso em: 27 jul. 2025.