The Importance Of Customer Satisfaction And Customer Complaint Towards A Better Quality Service Using Six Sigma: An Academic Perspective. Jurnal Teknologi, [S. l.], v. 53, n. 1, p. 107–126, 2012. DOI: 10.11113/jt.v53.117. Disponível em: https://journals.utm.my/jurnalteknologi/article/view/117.. Acesso em: 23 jul. 2024.