中国科学院数学与系统科学研究院期刊网
AMS
Invariant Curves of Reversible Mappings with Small Twist
Bin LIU, Jia Jia SONG
Acta Mathematica Sinica . 2004, (1): 15 -24 .  DOI: 10.1007/s10114-004-0316-4