Mulato, S., widyotomo, S. and Karia Purwadaria, H. (2006) “Performance of Disk Mill Type Mechanical Grinder for Size Reducing Process of Robusta Roasted Beans”, Pelita Perkebunan (a Coffee and Cocoa Research Journal), 23(3). doi: 10.22302/iccri.jur.pelitaperkebunan.v23i3.39.