ANURAG KUMAR SRIVASTAVA, SHAKTI RANJAN MOHAPATRA, MANIT MISHRA. Analysis of Various Customer based Services Rendered by the Mobile Phone Service Providers. European Economic Letters (EEL), [S. l.], v. 13, n. 1, p. 61–65, 2023. DOI: 10.52783/eel.v13i1.119. Disponível em: https://www.eelet.org.uk/index.php/journal/article/view/119. Acesso em: 28 oct. 2025.