CONG, C. B.; NGAN, R. T.; LONG, L. B. Some New De Morgan Picture Operator Triples in Picture Fuzzy Logic. Journal of Computer Science and Cybernetics, [S. l.], v. 33, n. 2, p. 143–164, 2018. DOI: 10.15625/1813-9663/33/2/10706. Disponível em: https://vjs.ac.vn/index.php/jcc/article/view/10706. Acesso em: 4 may. 2024.