Ravi Mani, “MIGRATION STRATEGIES FOR LEGACY BILLING SYSTEMS TO CLOUD PLATFORMS: CHALLENGES, APPROACHES, AND FUTURE DIRECTIONS”, IJCET, vol. 16, no. 01, pp. 1506–1520, Jan. 2025, Accessed: Feb. 04, 2026. [Online]. Available: https://ijcet.in/index.php/ijcet/article/view/296