MAKAROV, K. A.; BELYI, S.; TSEKANOVSKII, E. Conservative L-systems and the Livšic function. Methods of Functional Analysis and Topology, [S. l.], v. 21, n. 2, p. 104–133, 2015. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/606. Acesso em: 16 dec. 2025.