1. S. G. Krein,Linear Differential Equations in a Banach Space [in Russian], Fizmatgiz, Moscow (1967).
2. Yu. L. Daletskii and M. G. Krein,Stability of Solutions to Differential Equations in Banach Spaces [in Russian], Nauka, Moscow (1970).
3. D. Henry,Geometric Theory of Semilinear Parabolic Equations, Springer-Verlag, Berlin-Heidelberg-New York (1981).
4. E. Hille and R. Phillips,Functional Analysis and Semi-Groups, Colloq. Publ., Vol. 31, Amer. Math. Soc., Providence, R. I. (1957).
5. A. G. Baskakov, “Some conditions for the invertibility of linear differential and difference operators,”Dokl. Ross. Akad. Nauk [Russian Math. Dokl.],333, No. 3, 282–284 (1993).