Gouder, P.; Kolli, V.; Page, M. H.; Chavaraddi, K. B.; Chandaragi, P. The Homotopy Perturbation Method to Solve a Wave Equation. Comm. Math. Appl. 2022, 13 (2), 691-701. https://doi.org/10.26713/cma.v13i2.1764.