N. Srividya. “Predicting Customer Satisfaction in Urban Company: A Regression-Based Approach Using SERVQUAL Dimensions and Central Composite Design”. International Journal of Intelligent Systems and Applications in Engineering 12, no. 4 (June 12, 2024): 1761–1771. Accessed September 21, 2025. https://ijisae.org/index.php/IJISAE/article/view/6487.