Cuong, Bui Cong. 2022. “PYTHAGOREAN PICTURE FUZZY SETS(PPFS), PART 2- SOME MAIN PICTURE LOGIC OPERATORS ON PPFS AND SOME PICTURE INFERENCE PROCESSES IN PPF SYSTEMS”. Journal of Computer Science and Cybernetics 38 (1):1-14. https://doi.org/10.15625/1813-9663/38/1/15992.