Ashaari, Salbiah, SHERZOD TURAEV, and Abdurahim Okhunov. “Tree Valence Controlled Grammars”. International Journal on Perceptive and Cognitive Computing 3, no. 1 (July 20, 2017). Accessed April 18, 2024. https://journals.iium.edu.my/kict/index.php/IJPCC/article/view/48.