Law, C. L., C. W. Chong, and A. Figiel. “Intermittent Hot Air, Dehumidified Air, Heat Pump and Convective Cum Vacuum Microwave Drying Characteristics and Models”. ASEAN Journal of Chemical Engineering, Vol. 10, no. 2, Dec. 2010, pp. 10-15, https://journal.ugm.ac.id/v3/AJChE/article/view/8066.