1. CAPPELL ARI, J. O., et al. (editors.) “Mathematical Theory of the Goddard Trajectory Determination System,” NASA/GSFC Report, GSFC X-582-76-77, Greenbelt, Maryland, USA, 1976.
2. KWOK, J. H. “The Artificial Satellite Analysis Program (ASAP), Version 2.0,” EM 312/87-153, JPL, Pasadena, California, USA, April 1987.
3. PARDINI, C. and ANSELMO, A. “SATRAP: Satellite Reentry Analysis Program,” Internal Report C94-17, CNUCE Institute, CNR, Pisa, Italy, August 1994.
4. HOOTS, F. R. and ROEHRICH, R. L. “Models for Propagation of NORAD Elements Sets,” Spacetrack Report No. 3, Project Spacetrack, Aerospace Defense Command, United States Air Force, Colorado Springs, Colorado, USA, December 1980.
5. SEHNAL, L. and POSPISILOVA, L. “Thermospheric Model TD 88,” Preprint No. 67, Astronomical Institute, Czechoslovak Academy of Sciences, 1988.