[IEEE 2017 IEEE 58th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON) - Riga (2017.10.12-2017.10.13)] 2017 IEEE 58th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON) - A conceptual framework of perceived efficiency of CRM: Case of mobile phone operators in Tunisia

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