JOSEPH, H.; SUMAYA, . K. M. . Role of qualitative research in preventing customer churn: a case study of mobile network operators in Kenya. Operations Research Society of Eastern Africa, [S. l.], v. 7, n. 2, p. 13-27, 2017. Disponível em: https://orseajournal.udsm.ac.tz/index.php/orsea/article/view/63. Acesso em: 19 apr. 2024.