M.S. Khidr, Khidr, and Hikmat Sh. Mustafa. “Vertical Flow in Viscous Thin Films”. AL-Rafidain Journal of Computer Sciences and Mathematics 5, no. 1 (June 5, 2008): 33–41. Accessed December 17, 2025. https://csmj.uomosul.edu.iq/index.php/csmj/article/view/37103.