1. Nonlinear Two-point Boundary Value Problems;Bailey,1968
2. An Introduction to Nonlinear Boundary Value Problems;Bernfeld,1974
3. Coincidence degree and nonlinear differential equations;Gaines,1977
4. Nonlinear boundary value problems for ordinary differential equations;Granas;Dissnes Math.,1985
5. Bases of the Theory of Boundary Value Problems for Ordinary Differential Equations;Vasilev,1978