1. The Sturm-Liouville problem for a nonlinear ordinary second order differential equation;Arkhilov;Differentsial'nye Uravneniya (English translation),1967
2. Une remarque sur la methode de Banch-Cacciopoli-Tikhonov dans la theorie des equations differetielles ordinaries;Bielecki;Bull. Acad. Polon. Sci.,1956
3. Recent trends in the theory of booundary value problems for ordinary defferential equations;Conti;Boll. U. M. I.,1967
4. Conincidence degree, and nonlinear differetial equations Lecture Notes in Mathematics, 568;Gaines,1977
5. Uniqueness of solutions of boundary value problems for ordinary differential equations;Jackson;Siam J. A, Appl. Math.,1973