DR. PRADIP CHAKRABORTY, D. G. P. Telecommunication Service Usage Profile and Preference: A Comparative Study between Bsnl and Private Service Operators. Management and Economic Journal, [S. l.], p. 306–314, 2018. Disponível em: https://everant.in/index.php/mej/article/view/514. Acesso em: 15 nov. 2024.