scholarly journals A KAM theorem without action-angle variables for elliptic lower dimensional tori

Nonlinearity ◽  
2011 ◽  
Vol 24 (4) ◽  
pp. 1033-1080 ◽  
Author(s):  
Alejandro Luque ◽  
Jordi Villanueva
1999 ◽  
Vol 44 (13) ◽  
pp. 1187-1191 ◽  
Author(s):  
Shaoli Wang ◽  
Chongqing Cheng

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