中国科学院数学与系统科学研究院期刊网
Inequalities for Vertex Angles of a Simplex in Hyperbolic Space Hn(-1) and Spherical Space Sn(1)
Shi Guo YANG, Wen WANG, Ge BIAN
Acta Mathematica Sinica, Chinese Series . 2014, (6): 1101 -1108 .  DOI: 10.12386/A2014sxxb0101