SISMAN, Gulsah; DEMIRCI OREL, Fatma. Application of Six Sigma Methodology to Improve Customer Complaint Management. The Eurasia Proceedings of Educational and Social Sciences, [S. l.], v. 19, p. 1–10, 2020. Disponível em: https://epess.net/index.php/epess/article/view/610. Acesso em: 21 nov. 2024.