Valcheva, Desislava, and Evgeni Andreev. “COMPARISON BETWEEN TRADITIONAL IT INFRASTRUCTUREAND CLOUD SERVICE MODELS – TECHNOLOGICAL,ECONOMIC, AND OPERATIONAL ASPECTS”. E-Journal VFU, no. 24 (December 19, 2025): 790–798. Accessed February 23, 2026. https://ejournal.vfu.bg/index.php/vfu/article/view/251.