1. Asymptotic behaviour of linear integrodifferential systems;Barbu;Trans. Amer. Math. Soc.,1972
2. Semi-groups of Operators and Approximation;Butzer,1967
3. Generation of semigroups of nonlinear transformations on general Banach spaces;Crandall;Amer. J. Math.,1971
4. On an abstract functional differential equation with infinite delay;Dyson,1976
5. Functional differential equations and nonlinear evolution operators;Dyson,1975