Il’chenkoY. V., & Chaikovs’kyiA. V. (2011). Cauchy problem for a differential equation in the Banach space with generalized strongly positive operator coefficient. Ukrains’kyi Matematychnyi Zhurnal, 63(8), 1053-1070. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/2784