KUMAR, R. Remarks on Perturbation of M-Accretive Operators. The Journal of the Indian Mathematical Society, [S. l.], v. 66, n. 1-4, p. 89–95, 1999. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/21955. Acesso em: 1 may. 2024.