C. N. S. Ramnath Babu, and Dr. S. Sundar. “Identifying Key Selection Factors of Mobile Network Operator and Analysing Their Importance Versus Performance from SME Customers Perspective”. International Journal of Management Studies (IJMS), vol. 5, no. 3(4), Nov. 2021, pp. 23-34, https://researchersworld.com/index.php/ijms/article/view/1892.