1. TETRA Voice + Data, EN 300 392. Sophia Antipolis: ETSI, 2002.
2. TETRAPOL Specifications Part: PAS 0001-2, Version 3.0.0. Bois d'Arcy, France: TETRAPOL Forum, Nov. 1999.
3. APCO Project 25 Standards for Public Safety Digital Radio,1995
4. ETSI TS 102 181 Emergency Communications (EMTEL); Requirements for communication between authorities/organizations during emergencies, Feb. 2008.
5. 700 MHz public safety broadband task force report and recommendations;NPSTC,2009