GORBACHUK, V. I. On the singularity of representations of Hermitian indefinite functions and sequences. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 18, n. 2, p. 107–113, 1966. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8722. Acesso em: 6 dec. 2025.