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References:
[1] S. FUČÍK J. MAWHIN: Periodic solutions of some nonlinear differential equations of higher order. Čas. Pěst. Mat. 100 (1975), 276-283. MR 0385240
[2] J. J. LIONS: Quelques méthodes de résolution des problèmes aux limites non linéaires. Paris 1969. Zbl 0189.40603
[3] S. FUČÍK: Remarks on some nonlinear boundary value problems. Comment. Math. Univ. Carolinae 17 (1976), 721-730. MR 0427724
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