The Cauchy problem for a system of linear nonhomogeneous first order differential equations with rectangular matrices. Neliniini Kolyvannya, [S. l.], v. 16, n. 2, p. 173–190, 2013. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/691. Acesso em: 21 jan. 2026.