Preeti Nigam, Dr. S. K. Tiwari. “Measuring Customer Satisfaction and Retention in IT Industry Pre-COVID and Post-COVID Using Fuzzy Mathematical Model”. Journal of Computational Analysis and Applications (JoCAAA), vol. 33, no. 08, Aug. 2024, pp. 5205-11, https://www.eudoxuspress.com/index.php/pub/article/view/3181.