中国科学院数学与系统科学研究院期刊网
The Rotation Surfaces with Principal Curvature Satisfying(1/κ1)-(1/κ2)=c in R3
Dong Ming WANG, Zu Huan YU
Acta Mathematica Sinica, Chinese Series . 2011, (3): 427 -434 .  DOI: 10.12386/A2011sxxb0043