Abstract
By using Mawhin’s continuation theorem, the existence of even solutions with minimum positive period for a class of higher order nonlinear Duffing differential equations is studied.
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Wang, G., Cheng, S.S. Even periodic solutions of higher order duffing differential equations. Czech Math J 57, 331–343 (2007). https://doi.org/10.1007/s10587-007-0063-7
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DOI: https://doi.org/10.1007/s10587-007-0063-7