Butdee, S., and C. Trakunsaranakom. “QFDE Combined with TRIZ Framework to Formulate and Respond to Functional Design for a High Temperature Machine (HTM)”. Applied Science and Engineering Progress, vol. 3, no. 4, Sept. 2013, pp. 77-84, https://ph02.tci-thaijo.org/index.php/ijast/article/view/67393.