1. Bauer, M. ,Vermessung und Ortung mit Satelliten, Wichmann-Verlag, Heidelberg, Germany, p. 274 (1994) (in German).
2. Leick, A. ,GPS Satellite Surveying, 2nd ed., John Wiley & Sons, New York, p. 560 (1995).
3. Skeivalas, J. ,Electronic Instruments in Geodesy, Technika, Vilnius, Lithuania, p. 242 (2010) (in Lithuanian).
4. Koreliacinė analizė jonosferos įtakai GPS matavimams nustatyti