7Kono M.Gravity in East Nepal and their Implications to the Crust Structure of Himalayas.Geophys.J.R.Astr.Soc 1974,39:283～299.
8Elkins T A.Vertical Gradient of Gravity on Axis for Hollow and Solid Cylinders.Geophysics,1966,31(40):816～820.
9Rapp R H.Use of Potential Coefficient Models for Geoid Undulation Determinations Using a Spherical Harmonic Representation of the Height Anomaly Geoid Undutation.Journal of Geodesy,1997,71:282～289.
