Mishura, Y.S. (2000) “Existence of solutions of abstract volterra equations in a banach space and its subsets”, Ukrains’kyi Matematychnyi Zhurnal, 52(5), pp. 648–657. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4459 (Accessed: 5 December 2025).