1. Existence Theory for Nonlinear Integral and Integro-Differential Equations;O’Regan,1998
2. Positive Solutions of Differential, Difference and Integral Equations;Agarwal,1999
3. Volterra Integral and Differential Equations;Burton,1983
4. Nonlinear Functional Analysis;Deimling,1985
5. Measures of Noncompactness in Banach Spaces;Banas,1980