1. GPS NAVSTAR User's Overview, YEE-82-009, NAVSTAR GPS Joint Program Office September 1982
2. The Application of NAVSTAR Differential GPS in The Civilian Community;Beser;Journal of the Institute of Navigation,1982
3. Fickas , E. Wadsworth , I. GPS Field Test Measurement Program , International Telemetering Conference, Las Vegas, Nevada October 1984
4. High Dynamic Instrumentation Set (HDIS) Specification , YISP-83-14, United States Air Force (AD/YI), Eglin AFB, Florida July 1984