Qureshi MI, Bashir N, Zaman K, Sajjad N, Fakhr S. Customer Satisfaction Measurement and Analysis Using Six Sigma in Telecom Sector of Pakistan. EJSD [Internet]. 2012Feb.1 [cited 2024Nov.21];1(1):53 - 68. Available from: https://ecsdev.org/ojs/index.php/ejsd/article/view/5