REDCHUK, I. K.; ROITER, A. V. Singular locally scalar representations of quivers in Hilbert spaces and separating functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 6, p. 796–809, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3799. Acesso em: 5 dec. 2025.