Roy, Salil Kumar, and I Nyoman Sutapa. 2004. “CASE STUDIES OF USE OF DESIGN OF EXPERIMENTS IN MATERIAL RESEARCH”. Jurnal Teknik Industri: Jurnal Keilmuan Dan Aplikasi Teknik Industri 5 (1):32-40. https://doi.org/10.9744/jti.5.1.32-40.