BORDBAR, H. .; LONG XIN, X. .; BORZOOEI, R. A. .; BAE JUN, Y. Positive implicative ideals of BCK-algebras based on neutrosophic sets and falling shadows. Neutrosophic Sets and Systems, [S. l.], v. 48, p. 09-30, 2022. Disponível em: http://fs.unm.edu/NSS2/index.php/111/article/view/2089. Acesso em: 12 aug. 2022.