SOKOLOV, N. P. On multiplicative and spectral properties of space matrices with non-negative elements. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 18, n. 4, p. 72–78, 1966. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8314. Acesso em: 7 apr. 2025.