"Frequenznutzungsplan" [Frequency Use Plan] (PDF) (in German). April 2008. Archived from the original(PDF) on 28 November 2009. Retrieved 20 December 2009.
"GSM-R Frequencies India"(PDF). CHAPTER XVIII MOBILE COMMUNICATIONS – GSM-R. Indian Railways. Archived from the original(PDF) on 21 May 2012. Retrieved 13 April 2013.
"GSM-R Frequencies India"(PDF). GSM-R as a Global Standard. International Union of Railways (UIC), UIC ERTMS Conference 2004, Rome. Archived from the original(PDF) on 29 May 2013. Retrieved 13 April 2013.
"Frequenznutzungsplan" [Frequency Use Plan] (PDF) (in German). April 2008. Archived from the original(PDF) on 28 November 2009. Retrieved 20 December 2009.
"GSM-R Frequencies India"(PDF). CHAPTER XVIII MOBILE COMMUNICATIONS – GSM-R. Indian Railways. Archived from the original(PDF) on 21 May 2012. Retrieved 13 April 2013.
"GSM-R Frequencies India"(PDF). GSM-R as a Global Standard. International Union of Railways (UIC), UIC ERTMS Conference 2004, Rome. Archived from the original(PDF) on 29 May 2013. Retrieved 13 April 2013.