Mamat, Ali, and Mustafa Mat Deris. “An Effect of Simplifying Magic Rules For Answering Recursive Queries in Deductive Databases”. Malaysian Journal of Computer Science 10, no. 1 (June 1, 1997): 47–52. Accessed November 10, 2024. https://mjcs.um.edu.my/index.php/MJCS/article/view/3015.