CƯỜNG, Bùi Công. Picture fuzzy sets. <b>Journal of Computer Science and Cybernetics</b>, <i>[S. l.]</i>, v. 30, n. 4, p. 409, 2014. DOI: 10.15625/1813-9663/30/4/5032. Disponível em: https://jcc.vast.vn/jcc/article/view/5032. Acesso em: 4 nov. 2025.