Hồ, Nguyễn Cát, and Lê Xuân Vinh. “On Some Properties of Ordering Relation in Non-Homogeneous Hedge Algebras”. Journal of Computer Science and Cybernetics 19, no. 4 (July 27, 2012): 373–381. Accessed November 23, 2024. https://vjs.ac.vn/index.php/jcc/article/view/1546.