ShmardaZ. (1993) “Existence and uniqueness of solution of the Cauchy problem for singular systems of integro-differential equations”, Ukrains’kyi Matematychnyi Zhurnal, 45(12), pp. 1716–1720. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5983 (Accessed: 27July2024).