ARLINSKY, Yu. M. On proper accretive extensions of positive linear relations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 6, p. 723–730, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5464. Acesso em: 7 apr. 2025.