Khalaf, A.J.M. and Hanoon, W.H. 2014. Solving Some Kinds of Third Order Partial Differential Equations of Degree Four with Three Independent Variables. JOURNAL OF ADVANCES IN MATHEMATICS. 9, 5 (Nov. 2014), 2653–2676. DOI:https://doi.org/10.24297/jam.v9i5.2354.