V. M. . Gorbachuk, “Behaviour on the infinity of the solution of the differential-operator first order equation in the Banach space”, Ukr. Mat. Zhurn., vol. 40, no. 5, pp. 629–631, Aug. 1988, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8812