1. Autonomous Integrity;Azaola-Saenz;Inside GNSS,2009
2. Radio Technical Committee for Aeronautics: Minimum Operational Performance Standards for Airborne Equipment Using Global Positioning System/Wide Area Augmentation System, Doc. DO-229D, 2006.
3. Department of Defense, Department of Homeland Security, and Department of Transportation. Federal Radionavigation Plan, 2012, Springfield, Virginia, US.
4. Refining the Klobuchar ionospheric coefficients based on GPS observations
5. Extension of EGNOS ionospheric correction coverage area