scholarly journals A twist condition and periodic solutions of Hamiltonian systems

2008 ◽  
Vol 218 (6) ◽  
pp. 1895-1913 ◽  
Author(s):  
Zhaoli Liu ◽  
Jiabao Su ◽  
Zhi-Qiang Wang
2011 ◽  
Vol 74 (5) ◽  
pp. 1596-1606 ◽  
Author(s):  
Chun Li ◽  
Zeng-Qi Ou ◽  
Chun-Lei Tang

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