GSM: Béda antarrépisi

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* [http://www.gsmworld.com/ GSM Association – the group representing GSM operators (official site)] – includes coverage maps for all members

* [http://www.3gpp.org 3GPP The current standardization body for GSM with free standards available].

* [http://www.qrctech.com/freq_chart_24x36.pdf Most Widely Used Cellular Channelizations]