1. RRC unnecessary for DGPS messages
2. Schaer S. (1999). Mapping and Predicting the Earth's Ionosphere Using the Global Positioning System. Ph.D dissertation. Astronomical Institute, University of Berne, Switzerland.
3. What is the accuracy of DGPS?
4. Musa T.A. , Lim S. , Yan T. and Rizos C. (2006). Mitigation of Distance-Dependent errors for GPS Network Positioning. Proceedings of International Global Navigation Satellite Systems Society IGNSS Symposium, Surfers Paradise, Australia.