On semiperfect rings of injective dimension one. The São Paulo Journal of Mathematical Sciences, [S. l.], v. 1, n. 1, p. 111–132, 2007. DOI: 10.11606/issn.2316-9028.v1i1p111-132. Disponível em: https://revistas.usp.br/spjournal/article/view/5.. Acesso em: 27 may. 2024.