DIL'NA, N. Z.; RONTO, A. M. Some new conditions for the solvability of the cauchy problem for systems of linear functional-differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 7, p. 867–884, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3805. Acesso em: 5 dec. 2025.