中国科学院数学与系统科学研究院期刊网
Closed Characteristics on Asymmetric Convex Hypersurfaces in R2n and the Corresponding Pinching Conditions
Yu Jun DONG (Yujun DONG), Yi Ming LONG (Yiming LONG)
Acta Mathematica Sinica . 2004, (2): 223 -232 .