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. Key Issues for GSM-R and LTE-R
3. http://radiotech.pl/przetargi/1794-pkp-plk-rozstrzygnely-gigantyczny-przetarg-gsm-r-2-3-mld-zl-trafi-do-czterech-firm.html
. (Accessed 11 June 2018)
4. http://www.3gpp.org/technologies/keywords-acronyms/98-lte
. (Accessed 11 June 2018)
5. IEEE 1474.1 Standard for Communications – Based Train Control (CBTC) Performance and Functional Requirements