Celestino, S., and J. Auresenla. “Use of the Taguchi Design of Experiments to Optimize the Parameters of Cleaning Machines for Sensitive Plastic Products”. ASEAN Journal of Chemical Engineering, Vol. 2, no. 1, Dec. 2002, pp. 97-106, https://jurnal.ugm.ac.id/v3/AJChE/article/view/7532.