1. Positive Solutions of Differential, Difference and Integral Equations;Agarwal,1999
2. Nonlinear Functional Analysis;Deimling,1985
3. Differential inequalities for integral and delay differential equations;Burton,1994
4. Monotone Iterative Techniques for Nonlinear Differential Equations;Ladde,1985
5. Differential equations with integral boundary conditions;Jankowski;J. Comput. Appl. Math.,2002