SAMOILENKO, Yu. S.; SHULMAN, V. S.; TUROWSKA, L. B. Semilinear relations and their $*$-representations. Methods of Functional Analysis and Topology, [S. l.], v. 2, n. 1, p. 55–111, 1996. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/10. Acesso em: 19 dec. 2025.