1. Standard Methods for the Examination of Water and Wastewater;APHA,2005
2. Enzymatic treatment effects on dewaterability of anaerobically digested biosolids-I: performance evaluations;Ayol;Process Biochemistry,2005
3. Balsari, P., Bonfanti, P., Bozza, E., Sangiorgi, F., 1983. Evaluation of the influence of animal feeding on the performances of a biogas installation (mathematical model). In: Third International Symposium on Anaerobic Digestion A 20, p. 7.
4. Evaluation of parameters for monitoring anaerobic co-digestion process;BjÖrnsson;Applied Microbiology Biotechnology,2000
5. Boe, K., 2006. Online monitoring and control of the biogas process. Ph.D. Thesis, Institute of Environment & Resources, Technical University of Denmark.