9Weiland P,Rieger C,Ehrmann T,Evaluation of the newest biogas plants in Germany with respect to renewable energy production,greenhouse gas reduction and nutrient management[J/OL].http://websrv5.sdu.dk/bio/ work%2003/Pres/Peter_Weila-nd.pdf,2008-5-20.
10Kottner M,Direktor M.Agricultural AD inGermany[J/OL].http://www.methanetomarkets.org/events/2006/agriculture/docs/Michael_ Kottner_Agricultural_AD_in_Germany.pdf,2008-5-20.