Ali, H., M. Naveed, D. Naseem, and J. 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., Vol. 18, no. 2, Dec. 2020, pp. 89-01, doi:10.52584/QRJ.1802.14.