1. American Biogas Council (ABC). 2015. Digestate standard, certification & Testing protocol Program. Outline for development & use at ABC’s digestate standard (draft). In Proceedings of workshop, October 19, 2015, Danvers, Massachuttes.
2. Assessment of the fertiliser potential of digestates from farm and agroindustrial residues;Alburquerque;Biomass Bioenergy,2012
3. Evaluation of chemical and ecotoxicological characteristics of biodegradable organic residues for application to agricultural land;Alvarenga;Environ. Int.,2007
4. Anonymous, 2001. Ordinance on Environmentally Compatible Storage of Waste from Human Settlements and on Biological Waste Treatment Facilities, Berlin, Germany (20.02.01.).
5. APAT (Italian Environmental Agency) and IRSA-CNR (Italian Water Research Institute), 2003. Metodi analitici per le acque.