Petrov, Pavel, and Vassil Milev. “ANALYSIS AND APPLICATION OF CRM SYSTEMS IN THE FIELD OF EDUCATION”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 2 (June 22, 2024): 237–241. Accessed May 4, 2025. https://journals.ru.lv/index.php/ETR/article/view/8029.