THUẦN, Hồ; GIAO, Hoàng Thị Lan. Discuss with properties a P.F. should posses and what constitutes a resonable extension of an operator relative to a given P. E. <b>Journal of Computer Science and Cybernetics</b>, <i>[S. l.]</i>, v. 19, n. 4, p. 359–365, 2012. DOI: 10.15625/1813-9663/19/4/1544. Disponível em: https://jcc.vast.vn/jcc/article/view/1544. Acesso em: 4 nov. 2025.