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MR1926629 (2003f:37111) 37J45 (34C25 47J30 58E05)
Xu, Yuan-Tong; Guo, Zhi-Ming Existence of periodic solutions to second-order Hamiltonian systems with potential indefinite in sign. Nonlinear Anal. 51 (2002), no. 7, 1273–1283.
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