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[1] G. G. Hamedani: Periodic Boundary Value Problems for Nonlinear Second Order Vector Differential Equations. To appear in Revue Roum. De Math. Pures Et App.
[2] B. Mehri, G. G. Hamedani: On the Existence of Periodic Solutions of Nonlinear Second Order Differential Equations. SIAM J. Appî. Math. Vol. 29, No. 1, July 1975. MR 0369824 | Zbl 0322.34027
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