M. Jassim, A., and احمد. “An Extension Use of ADI Method in the Solution of Biharmonic Equation”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 3, no. 1, June 2025, pp. 85-94, https://rjps.uomosul.edu.iq/index.php/csmj/article/view/20051.