Field, Jim; Sierra, Reyes (2003-04-27). "Anaerobic Granular Sludge Bed Reactor Technology". University of Arizona. Archived from the original on 2006-07-06. https://web.archive.org/web/20060706215607/http://www.uasb.org/discover/agsb.htm ↩
"Granular sludge". Archived from the original on 2006-07-06. https://web.archive.org/web/20060706215607/http://www.uasb.org/discover/agsb.htm#figure%201 ↩