[Januszewski J. (2001). Visibility and Geometry of Galileo Constellations, Artificial Satellites, Vol. 36, No. 4, 131-142]Search in Google Scholar
[Januszewski J. (2003). Visibility of Satellite Navigation Systems in Urban Area, Artificial Satellites, Vol. 38, No. 2, 55-65]Search in Google Scholar
[Januszewski J. (2005). Geometry and Visibility of Satellite Navigation Systems in Restricted Area, Institute of Navigation National Technical Meeting, San Diego (CA), January 2005]Search in Google Scholar
[Leonard A., Krig. H., Blomenhofer E. (2003). Global Impact of GPS and Galileo Constellation Drifts on GNSS Performance, 11th IAIN World Congress, Berlin 2003 http://www.navcen.uscg.gov]Search in Google Scholar