VETROVA, E. V.; CHEREPENNIKOV, V. B. One method for the investigation of linear functional-differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 4, p. 594–600, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2443. Acesso em: 5 dec. 2025.