SUBAKARAN, P. Challenges in a Commodity Offering - Indian Telecom Services (GSM). Indian Journal of Marketing, [S. l.], v. 42, n. 12, p. 54–63, 2012. Disponível em: https://www.indianjournaloffinance.co.in/index.php/ijom/article/view/37010. Acesso em: 5 feb. 2026.