Tryckt material
Biedermann, Hans; Symbollexikonet, Stockholm 1991 (1989)
Hofman et al; Global positioning system, theory and practice, Wien, 1994 (1992)
Nordstedt, Jim.R; Geodetisk mätningsteknik Göteborg. 1993
Understanding GPS: principles and applications ed. Elliot D. Kaplan, Boston, Artech House, cop. 1996
Thompson Jan; MatematiklexikonWahlström & Widstrand Falun 1994
Web-material
Eng Tech Linköping http://www.geocities.com/RodeoDrive/2099/EngTech.html
World Geodetic system 1984 http://www.tmpo.dma.gov/publications/guides/dft/wgs1984.html
The great Globe gallery http://hum.amu.edu.pl/~zbzw/glob/globo.htm
Transformation between WGS 84 and PZ-90 http://satnav.atc.ll.mit.edu/papers/PZ90-WGS84/PZ90-WGS84.html#coord