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[2]  Bao D, Robles C. On Randers spaces of constant flag curvature.  Rep on Math Phys, 2003, 51:  9--42

[3] Cheng X, Shen Z.  Randers metrics with special curvature properties. Osaka J Math, 2003, 40:  87--101

[4]  Shen Z. Differential Geometry of Spray and Finsler Space. Dordrecht: Kluwer Academic Publishers, 2001

[5]  Cheng X, Mo X, Shen Z.  On the flag curvature of Finsler metrics of scalar curvature. J London Math, 2003, 68(2): 762--780

[6]  Chern S S, Shen Zhongmin.  Riemman-Finsler Gemometry.  Singapore: Word Scientific Publisher, 2005

[7]  Bacso S, Cheng X, Shen Z. Curvature properties of α, β-metrics. Advanced Studies in pure Mathematics Math Soc of Japan, 2007,  48: 73--110

[8]  Shen Zhongmin. Riemann Finsler geometry with applications to information geometry. Ann Math, 2006, 27B(1): 73--94

[9]  Hamel G. Uber die Geometrieen in denen die Geraden die Kiirzesten sind. Math Ann, 1903, 57: 231--264

[10]  崔宁伟.关于(α, β)度量的S -曲率.数学物理学报, 2006, 26A(7): 1047--1056