1. Navigation Requirements for Geophysical Exploration;Sheriff;Geophysical Prospecting,1974
2. The Role of Navigation Satellites in Oil Exploration;Morgan;Navigation,Spring 1979
3. Position Fixing Requirements of the Oil Industry;Haugh;The International Hydrographic Review,January 1981
4. Stuifbergen , N. SYLEDIS-A New Medium-Range Positioning System Lighthouse, Edition No. 18 November 1978
5. Sampson Stephen Jekel Richard N. Model DM-54 ARGO System Proceedings of IEEE PLANS 78 Position Location and Navigation Symposium, San Diego, California November 69, 1978