1. World Geodetic System—1984 (WGS-84) Manual,2002
2. The Development of the Joint NASA GSFC and NIMA Geopotential Model EGM96, NASA Goddard Space Flight Center, Greenbelt, Maryland, 20771 USA;Lemoine,1998
3. EGM2008: the development and evaluation of the earth gravitational model 2008 (EGM2008);Nikolaos;Journal of Geophysical Research: Solid Earth,2012
4. Space Engineering – Space Environment,2008
5. Cavendish Experiment;Gregersen,2019