A Method of Directly Defining the inverse Mapping for a nonlinear partial differential equation and for systems of nonlinear partial differential equations. - C. W. Sahabandu; Dilini Karunarathna; P. Sewvandi; Z. A. M. S. Juman; Mangalagama Dewasurendra; K. Vajravelu (Comput. Appl. Math., 2021)