Carrasco, Ramón Alberto, María Francisca Blasco, Jesús García-Madariaga, Ana Pedreño-Santos, and Enrique Herrera-Viedma. “A Model to Obtain a SERVPERF Scale Evaluation of the CRM Customer Complaints: An Application to the 4G Telecommunications Sector”. Technological and Economic Development of Economy 24, no. 4 (August 28, 2018): 1606-1629. Accessed November 13, 2024. https://gc.vgtu.lt/index.php/TEDE/article/view/5080.