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[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
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[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.
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