Vetrova, E.V. and Cherepennikov, V.B. (2013) “One method for the investigation of linear functional-differential equations”, Ukrains’kyi Matematychnyi Zhurnal, 65(4), pp. 594–600. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2443 (Accessed: 5 December 2025).