KAPADIA, D. D. Progress Report. The Journal of the Indian Mathematical Society, [S. l.], v. 9, n. 4, p. 133–133, 1917. DOI: 10.18311/jims/1917/17609. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/17609. Acesso em: 4 may. 2024.