Khalaf, Abdul Jalil M, and Wafaa Hadi Hanoon. “Solving Some Kinds of Third Order Partial Differential Equations of Degree Four With Three Independent Variables”. JOURNAL OF ADVANCES IN MATHEMATICS 9, no. 5 (November 15, 2014): 2653–2676. Accessed July 3, 2024. https://rajpub.com/index.php/jam/article/view/2354.