1. W. Arendt and H. Kellermann,Integrated solutions of Volterra integro-differential equations and applications, in ?Volterra Integro-differential Equations in Banach Spaces and Applications? (G. Da Prato and M. Iannelli, Eds.), pp. 21?51, Proc. Conf. Trento, Pitman, 1989.
2. Jung-Chan Chang and Sen-Yen Shaw,Perturbation theory of abstract Cauchy problems and Volterra equations, Nonlinear Analysis, TMA30 (1997), 3521?3528.
3. G. Da Prato and M. Iannelli,Linear integro-differential equation in Banach space, Rend. Sem. Math. Padova62 (1980), 207?219.
4. W. Desch and W. Schappacher,Some generation results for perturbed semigroups, in ?Trends in Semigroup Theory and Application? (Ph. Clément et al, Eds.), pp. 125?152, Marcel Dekker, New York, 1989.
5. K.-J. Engel and R. Nagel,One-parameter Semigroups and Linear Evolution Equations, GTM, Vol. 194, Springer, Berlin, New York, 2000