TUGANBAEV, A. A. Plane modules and distributive rings. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 5, p. 721–724, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5860. Acesso em: 5 dec. 2025.