Large subharmonics of pendulum-like equations, In `The first 60 years of NONLINEAR ANALYSIS of JEAN MAWHIN`, Eds. M. Delgado, J.Lopez-Gomez, R.Ortega, A.Suarez, World Scientific Publishing, 2004, 103-116
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| Authors: Krasnosel'skii A., Pokrovskii A.V. |