APA (7th ed.) Citation

Helm, A. (2008). Ground-based GPS altimetry with the L1 OpenGPS receiver using carrier phase-delay observations of reflected GPS signals. GFZ.

Chicago Style (17th ed.) Citation

Helm, Achim. Ground-based GPS Altimetry with the L1 OpenGPS Receiver Using Carrier Phase-delay Observations of Reflected GPS Signals. Potsdam: GFZ, 2008.

MLA (9th ed.) Citation

Helm, Achim. Ground-based GPS Altimetry with the L1 OpenGPS Receiver Using Carrier Phase-delay Observations of Reflected GPS Signals. GFZ, 2008.