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Office of Electronic Communications. (September 9, 2020). Duration of outbound roaming voice calls in mobile telephony in Poland from 2010 to 2019 (in million call minutes) [Graph]. In Statista. Retrieved March 07, 2021, from https://www.statista.com/statistics/1025616/poland-duration-of-mobile-roaming-voice-calls/
Office of Electronic Communications. "Duration of outbound roaming voice calls in mobile telephony in Poland from 2010 to 2019 (in million call minutes)." Chart. September 9, 2020. Statista. Accessed March 07, 2021. https://www.statista.com/statistics/1025616/poland-duration-of-mobile-roaming-voice-calls/
Office of Electronic Communications. (2020). Duration of outbound roaming voice calls in mobile telephony in Poland from 2010 to 2019 (in million call minutes). Statista. Statista Inc.. Accessed: March 07, 2021. https://www.statista.com/statistics/1025616/poland-duration-of-mobile-roaming-voice-calls/
Office of Electronic Communications. "Duration of Outbound Roaming Voice Calls in Mobile Telephony in Poland from 2010 to 2019 (in Million Call Minutes)." Statista, Statista Inc., 9 Sep 2020, https://www.statista.com/statistics/1025616/poland-duration-of-mobile-roaming-voice-calls/
Office of Electronic Communications, Duration of outbound roaming voice calls in mobile telephony in Poland from 2010 to 2019 (in million call minutes) Statista, https://www.statista.com/statistics/1025616/poland-duration-of-mobile-roaming-voice-calls/ (last visited March 07, 2021)
