Butdee, Suthep, and C. Trakunsaranakom. 2013. “QFDE Combined with TRIZ Framework to Formulate and Respond to Functional Design for a High Temperature Machine (HTM)”. Applied Science and Engineering Progress 3 (4):77-84. https://ph02.tci-thaijo.org/index.php/ijast/article/view/67393.