On semiperfect rings of injective dimension one. 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://periodicos.usp.br/spjournal/article/view/5.. Acesso em: 17 abr. 2025.