中国科学院数学与系统科学研究院期刊网
The Hyperbolic Gauss Map and Normal Gauss Map of Surfaces in 3-Dimensioual Hyperbolic Space
Shu Guo SHI
Acta Mathematica Sinica, Chinese Series . 2004, (1): 1 -10 .  DOI: 10.12386/A2004sxxb0001