Hồ, Nguyễn Cát, and Huỳnh Văn Nam. “Lattice Character of the Refinement Structure of Hedge Algebras”. Journal of Computer Science and Cybernetics 12, no. 1 (April 3, 2016): 7–20. Accessed May 3, 2024. https://vjs.ac.vn/index.php/jcc/article/view/8041.