HOSHAN, Naser. Dual series method for solving Helmholtz equation with mixed boundary conditions of the third kind. International Journal of Applied Mathematical Research, [S. l.], v. 3, n. 4, p. 473–476, 2014. DOI: 10.14419/ijamr.v3i4.2472. Disponível em: https://sciencepubco.com/index.php/ijamr/article/view/2472.. Acesso em: 2 may. 2024.