Dwiyana Puji Lestari, M. Dachyar. Improvement of Service Quality for Customer Satisfaction with Lean Six Sigma Method and Development Quality Function Deployment. Case: Telecommunication Company in Indonesia. IJAST [Internet]. 2020May1 [cited 2024May2];29(7s):3605-13. Available from: http://sersc.org/journals/index.php/IJAST/article/view/17661