S. YAHYA MOHAMED; P. UMAMAHESWARI. Vague positive implicative filter of BL- algebras. Malaya Journal of Matematik, India, v. 8, n. 01, p. 166–170, 2020. DOI: 10.26637/MJM0801/0028. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/1362. Acesso em: 5 nov. 2024.