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References:
[1] A. C. Lazer, P. J. McKenna: A semi-Fredholm principle for periodically forced systems with homogeneous nonlinearities. Proc. Amer. Math. Soc., 106(1989), 119-125. MR 0942635 | Zbl 0683.34027
[2] J. Mawhin: Topological Degree Methods in Nonlinear Boundary Value Problems. CBMS Conference in Math. n°. 40, Americal Mathematical Soc., Providence, Rhode Island, 1979. MR 0525202 | Zbl 0414.34025
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