1. Philosophiae Naturalis Principia Mathematica;Newton,1833
2. Recherches sur l’attraction des sphéroïdes homogènes;Legendre,1785
3. The Theory of Spherical and Ellipsoidal Harmonics;Hobson,1931
4. Theory of Satellite Geodesy, Chap. 1;Kaula,1966
5. The yielding of the Earth to disturbing forces;Love,1909