Silapanuntakul, Suthep, 		Ninkranjanakun, Nuttawat, 		Inthorn, Duangrat, AND 		Pandii, Wongdyan.
" Use of appropriate ratio of scum mixed with coffee residue  as briquette derived fuel" <em>Naresuan University Journal: Science and Technology (NUJST)</em> [Online], Volume 23 Number 3 (6 January 2016)