scholarly journals Periodic solutions of prescribed energy for a class of Hamiltonian systems with singular potentials

1989 ◽  
Vol 82 (1) ◽  
pp. 60-70 ◽  
Author(s):  
Vieri Benci ◽  
Fabio Giannoni
2011 ◽  
Vol 74 (5) ◽  
pp. 1596-1606 ◽  
Author(s):  
Chun Li ◽  
Zeng-Qi Ou ◽  
Chun-Lei Tang

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