CUONG, Bui Cong. Pythagorean picture fuzzy sets (PPFS), Part 2- some main picture logic operators on PPFS and some picture inference processes in PPF systems. <b>Journal of Computer Science and Cybernetics</b>, <i>[S. l.]</i>, v. 38, n. 1, p. 1–14, 2022. DOI: 10.15625/1813-9663/38/1/15992. Disponível em: https://vjs.ac.vn/jcc/article/view/15992. Acesso em: 5 dec. 2025.