1. ETSI TS 101 376 V1.1.1 GMR-1 technical specifications
2. ETSI TS 101 376 V2.1.1 GMPRS technical specifications
3. Ravishankar C Peri S Barnett C Design and performance of a GPRS based mobile satellite system Proceedings of IEEE 60th Vehicular Technology Conference 4032 4036
4. General system description
5. Ravishankar C Morris A Barnett C Noerpel A Jong J Design and performance of a 3G mobile satellite system 1946 1951