Ruận, Đặng Huy, and Nguyễn Thế Bình. “The Family of Languages Accepted by Pushdown Automata With 5-Components”. Journal of Computer Science and Cybernetics 17, no. 4 (August 1, 2012): 69–72. Accessed January 12, 2026. https://jcc.vast.vn/jcc/article/view/2294.