ISTRATESCU, V. On a Lemma of O’Raifeartaigh and Segal. The Journal of the Indian Mathematical Society, [S. l.], v. 33, n. 1, p. 57–58, 1969. DOI: 10.18311/jims/1969/16744. Disponível em: https://informaticsjournals.com/index.php/jims/article/view/16744. Acesso em: 28 apr. 2024.