NECESSITY OF CUSTOMER LOYALTY FORMATION AND ITS PECULIARITIES IN THE TELECOMMUNICATION SERVICES. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 1, p. 142–146, 2019. DOI: 10.17770/etr2019vol1.4124. Disponível em: https://archive-journals.rtu.lv/etr/article/view/4236.. Acesso em: 11 mar. 2026.