1. Bao, David, Chern, Shiing-Shen and Shen, Zhongmin (in preparation) An Introduction to Riemann-Finsler Geometry.
2. Bao, David and Lackey, Brad (1996) A Hodge Decomposition Theorem for Finsler Spaces, C. R. Acad. Sc. Paris, 223, 51–56.
3. Busemann, Herbert (1947) Intrinsic Area, Annals of Math., 48, 234–267.
4. Gray, A., and Vanhecke, L. (1979) Riemannian Geometry as Determined by the Volumes of Small Geodesic Balls, Ada Mathematica, 142, no.3-4, 157–198.
5. Hotelling, Harold (1939) Tubes and Spheres in n-Spaces and a Class of Statistical Problems, American Journal of Mathematics, 61,. 440–460.