A KAM theorem without action-angle variables for elliptic lower dimensional tori
2015 ◽
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pp. 45-61
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2017 ◽
Vol 37
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pp. 2141-2160
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1998 ◽
Vol 192
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pp. 145-168
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2004 ◽
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1999 ◽
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pp. 311-326
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