Operator $\Box^{r}$ on a submanifold of Riemannian manifold and its applications. Armenian Journal of Mathematics, [S. l.], v. 7, n. 1, p. 6–31, 2015. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/108.. Acesso em: 29 apr. 2024.