[1] Gaines R. E., Mawhin Ј. L.:
Coincidence Degree and Nonlinear Differential Equations. Springer Verlag, Berlin - Heidelberg - New Yoгk, 1977.
MR 0637067 |
Zbl 0339.47031
[2] Granas A., Guenther R. B., Lee J. W.:
Some General Existence Principles in the Carathéodory Theory of Nonlinear Differential Systems. J. Math. pures et appl. 70 (1991), 153-196.
MR 1103033 |
Zbl 0687.34009
[3] Lepin A. Ja, Lepin L. A.: Boundary Value Problem for the Ordinary Differential Equations of the Second Order. (Russian), Zinatne, Riga, 1988.
[4] Mawhin J. L.:
Topological Degree Methods in Nonlinear Boundary Value Problems. Providence, R. I., 1979.
MR 0525202 |
Zbl 0414.34025
[5] Mawhin J. L., Rouche N.: Equations Différentielles Ordinaires II. Masson et Cгe, Paгis, 1973.
[6] Rachůnková L.: Sign conditions in nonlinear boundary value problems. to appear.