AVADHANI, T. V. On the Summability of Eigenfunction Expansions I. The Journal of the Indian Mathematical Society, [S. l.], v. 18, n. 1, p. 9–18, 1954. DOI: 10.18311/jims/1954/17013. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/17013. Acesso em: 8 may. 2024.