1. Enge , P. K. Ruane , M. F. Shenynblatt , L. Marine Radiobeacons for the Broadcast of Differential GPS Data November 1986
2. International Association of Lighthouse Authorities Technical Characteristics of Differential Transmissions from Maritime Radiobeacons for Global Satellite Navigation Systems August 1991
3. Schonhoff , T. A Differential GPS Receiver System Using Atmospheric Noise Mitigation Techniques September 1991
4. Forward Error Correction for Radiobeacon Broadcast of Differential GPS Data;Enge;IEEE Transactions on Aerospace and Electronic Systems,January 1993