CUONG, B. C. Pythagorean Picture Fuzzy Sets, Part 1- basic notions. Journal of Computer Science and Cybernetics, [S. l.], v. 35, n. 4, p. 293–304, 2019. DOI: 10.15625/1813-9663/35/4/13898. Disponível em: https://vjs.ac.vn/index.php/jcc/article/view/13898. Acesso em: 19 apr. 2024.