Hieu D. Vu, “LANGUAGE IMPLEMENTATION FOR PUSH DOWN AUTOMATA (PDA)”, IJCET, vol. 14, no. 2, pp. 17–28, Jun. 2023, Accessed: Apr. 17, 2026. [Online]. Available: https://openlibindex.com/index.php/IJCET/article/view/IJCET_14_02_002