1. Arendt W.,Resolvent positive operators and integrated semigroups, Proc. London Math. Soc.54 (1987), 321–349.
2. Daleckii, J. L. and M. G. Krein, “Stability of solutions of differential equations in Banach space,” Am. Math. Soc., 1974.
3. Da Prato, G. and E. Sinestrari,On the Phillips and Tanabe regularity theorems, Semesterbericht Funktionalanalysis, Tübingen, Sommersemester 1985, 117–124.
4. Da Prato, G. and E. Sinestrari,Differential operators with non dense domain, Ann. Sc. Norm. Sup. Pisa14 (1987), 285–344.
5. Kato, T., “Perturbation theory of linear operators”, Springer-Verlag, New-York, 1966.