DROZD, Yu. A. Rejection lemma and almost split sequences. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 73, n. 6, p. 780–798, 2021. DOI: 10.37863/umzh.v73i6.6580. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/6580. Acesso em: 5 dec. 2025.