M. Al-Rozbayani, A., and M. H. Yahya. “Alternating Direction Implicit Method for Solving Parabolic Partial Differential Equations in Three Dimensions”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 9, no. 2, Dec. 2012, pp. 79-97, doi:10.33899/csmj.2012.163703 .