5ZHOU Jiang wen.Collocation by Two variant Methods[J].Acta Geodaetica at Cartographical Sinica, 1981, 10 (1) :9-12.(in Chinese)
6ZHANG Qin,LIU Wan -lin. Finite element Method in determining local geoid by using GPS leveling[A].ZHANG Zhen-lu. International Symposium on Current Crustal Movement and Hazare Reduction[C].Wuhan:Seismological Press,1997,441-451.
7LIU Q W,CHEN Y Q.Combining the geodetic models of verlical cruslal deformation[J].Journal of Geodetic,1998,7(2):673-683.