SAVICH, Yu. A.; CHERNYSHEVA, G. N.; IVASHININA, T. B. Modern Problems of Increasing Profitability and Competitiveness of Telecommunication Companies. Region: Systems, Economics, Management, [S. l.], v. 1, n. 2 (69), p. 211–217, 2025. Disponível em: https://region-systems.owebs.ru/article/view/18853. Acesso em: 8 nov. 2026.