KWON, Y. K.; SARIO, L. Harmonic Functions on a Subregion of a Riemannian Manifold. The Journal of the Indian Mathematical Society, [S. l.], v. 35, n. 1-4, p. 135–161, 1971. DOI: 10.18311/jims/1971/16726. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/16726. Acesso em: 2 may. 2024.