1. The Application of NAVSTAR Differential GPS in the Civilian Community;Beser;Navigation,1982
2. OMEGA Signal Coverage Prediction;Borty;Navigation,1976
3. American Practical Navigator;Bowditch;US Navy Hydrographic Office Publ. 9,1958
4. Optimal Processing of GPS Signals;Copps;Navigation,1980
5. History of Loran C;Frank;Navigation,1982