Ali, Hassan, Muhammad Naveed, Dilawar Naseem, and Jawaid Shabbir. “LL (1) Parser Versus GNF Inducted LL (1) Parser on Arithmetic Expressions Grammar: A Comparative Study”. Quaid-E-Awam University Research Journal of Engineering, Science & Technology, Nawabshah. 18, no. 2 (December 31, 2020): 89-101. Accessed July 3, 2022. http://publications.quest.edu.pk/ojs-3.1.1-4/index.php/qrj/article/view/197.