NAJAFI, Maliheh. Using He’s variational method to seek the traveling wave solution of PHI-four equation. International Journal of Applied Mathematical Research, [S. l.], v. 1, n. 4, p. 659–665, 2012. DOI: 10.14419/ijamr.v1i4.411. Disponível em: https://www.sciencepubco.com/index.php/ijamr/article/view/411.. Acesso em: 29 apr. 2024.