MINAKSHISUNDARAM, S. Eigenfunctions on Riemannian Manifolds. The Journal of the Indian Mathematical Society, [S. l.], v. 17, n. 4, p. 159–165, 1953. DOI: 10.18311/jims/1953/17029. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/17029. Acesso em: 1 may. 2024.