2Kwak S, Shin D, Kim T G.Analysis of Orbit Interpolation and Extrapolation Accuracy for High Precision Topographic Mapping Using Satellite Images.In:Proceeding of Asian Conference on Remote sensing, Hong Kong, China,November 22-25.
3Numerical recipes in Fortran 90.http://www.library.cornell.edu/nr/bookf90pdf/chap3f9.pdf/.