中国科学院数学与系统科学研究院期刊网
Totally Umbilical Property of Hyper-surfaces in a Positive Curvature Space Form and Higher Order Curvature
Qi WANG
Acta Mathematica Sinica, Chinese Series . 2014, (1): 47 -50 .  DOI: 10.12386/A2014sxxb0005