ON THE ELZAKI SUBSTITUTION AND HOMOTOPY PERTUBATION METHODS FOR SOLVING PARTIAL DIFFERENTIAL EQUATION INVOLVING MIXED PARTIAL DERIVATIVES . FJS [Internet]. 2021 Nov. 2 [cited 2025 Sep. 2];5(3):159-68. Available from: https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/668