1. An Introduction to Nonlinear Boundary Value Problems;Bernfeld,1974
2. Nonlinear Boundary Value Problems for Ordinary Differential Equations;Granas,1985
3. Topological Degree Methods in Nonlinear Boundary Value Problems, CBMS Regional Conference Series in Mathematics;Mawhin,1979
4. Theory of Singular Boundary Value Problems;O'Regan,1994
5. Recent trends in the theory of boundary value problems for ordinary differential equations;Conti;Boll. Un. Mat. Ital.,1967