Effectiveness of Push (SMS) Service: A Study on Grameenphone and Airtel Subscribers of Bangladesh. Global Journal of Management and Business Research, [S. l.], v. 15, n. 31, p. 17–43, 2015. Disponível em: https://journalofbusiness.org/index.php/GJMBR/article/view/. Acesso em: 18 oct. 2026.