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European Commission. (May 30, 2016). Distribution of agreement regarding telecommunications contracts containing sufficient and clear information on the quality of service subscribed to in Portugal in 2015 [Graph]. In Statista. Retrieved March 05, 2021, from https://www.statista.com/statistics/647510/telecommunications-contract-quality-of-service-information-in-portugal/
European Commission. "Distribution of agreement regarding telecommunications contracts containing sufficient and clear information on the quality of service subscribed to in Portugal in 2015." Chart. May 30, 2016. Statista. Accessed March 05, 2021. https://www.statista.com/statistics/647510/telecommunications-contract-quality-of-service-information-in-portugal/
European Commission. (2016). Distribution of agreement regarding telecommunications contracts containing sufficient and clear information on the quality of service subscribed to in Portugal in 2015. Statista. Statista Inc.. Accessed: March 05, 2021. https://www.statista.com/statistics/647510/telecommunications-contract-quality-of-service-information-in-portugal/
European Commission. "Distribution of Agreement regarding Telecommunications Contracts Containing Sufficient and Clear Information on The Quality of Service Subscribed to in Portugal in 2015." Statista, Statista Inc., 30 May 2016, https://www.statista.com/statistics/647510/telecommunications-contract-quality-of-service-information-in-portugal/
European Commission, Distribution of agreement regarding telecommunications contracts containing sufficient and clear information on the quality of service subscribed to in Portugal in 2015 Statista, https://www.statista.com/statistics/647510/telecommunications-contract-quality-of-service-information-in-portugal/ (last visited March 05, 2021)
