Gorbachuk, V. I., and M. L. Gorbachuk. 2005. “On Well-Posed Solvability in Some Classes of Entire Functions of the Cauchy Problem for Differential Equations in a Banach Space”. Methods of Functional Analysis and Topology 11 (2): 113-25. https://zen.imath.kiev.ua/index.php/mfat/article/view/272.