1. DECO: Telecomunicações sempre no topo das reclamações (2019). https://www.deco.proteste.pt/institucionalemedia/imprensa/comunicados/2019/telecons-1705. Accessed 10 May 2020
2. Fly, A.: 5 Best Practices for AI- and Data-Driven Call Centers. https://towardsdatascience.com/5-best-practices-for-ai-and-data-driven-call-centers-647406b4234b. Accessed 7 June 2020
3. Hassan, R.S., Nawaz, A., Lashari, M.N., Zafar, F.: Effect of customer relationship management on customer satisfaction. Procedia Econ. Financ. 23(October 2014), 563–567 (2015)
4. Lecture Notes in Computer Science (Lecture Notes in Artificial Intelligence);D Carneiro,2015
5. Tundjungsari, V.: Business intelligence with social media and data mining to support customer satisfaction in telecommunication industry. Int. J. Comput. Sci. Electron. Eng. 1(1), 1–4 (2013)