1. AEOLOS, 2002. An End-of-Life of Product Systems. EVEN – European Virtual Engineering Network. Project funded by the European Community under the Competitive and Sustainable Growth Programme (1998–2002). Project No. GTC2-2001-33012.
2. Biomethanation II;Ahring,2003
3. Combining anaerobic digestion with enclosed tunnel composting;Blischke;BioCycle,2004
4. Buekens, A., 2005. Energy Recovery from Residual Waste by means of Anaerobic Digestion Technologies. Conference “The Future of Residual Waste Management in Europe”, 17–18 November, Luxemburg.
5. Detection and survival of pathogens during two-stage thermophilic/mesophilic anaerobic digestion of suspended organic waste;Burtscher;Water Science Technology,1998