CUSTOMER RELATIONSHIP MANAGEMENT (CRM) AND ITS IMPACT ON PERFORMANCE IMPROVEMENT OF COMPANIES IN IRAN TELECOMMUNICATIONS. Singaporean Journal of Business Economics and Management, [S. l.], v. 1, n. (10), p. 6–10, 2013. Disponível em: https://www.singaporeanjbem.com/index.php/SJBEM/article/view/94. Acesso em: 24 jun. 2026.