@inproceedings{iapg7,

	author = {Svehla, D. and Heinze, M.},
	title = {Positioning with the four GNSS systems: GPS, GLONASS, GALILEO and BEIDOU based on phase clocks},
	booktitle = {European Geosciences Union General Assembly 2007},
	year = {2007},

        month = {04},












	
}