SHAVAROVSKYY, B. Z. Decomposition of polynomial matrices into a direct sum of triangular summands. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 8, p. 1144–1148, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4709. Acesso em: 5 dec. 2025.