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"Multiple periodic solutions to a class of second-order nonlinear ..."
Xiao-Bao Shu, Yuan-Tong Xu (2005)
- Xiao-Bao Shu, Yuan-Tong Xu:
Multiple periodic solutions to a class of second-order nonlinear mixed-type functional differential equations. Int. J. Math. Math. Sci. 2005(17): 2689-2702 (2005)
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