1. Biomass gasification cogeneration – a review of state of art technology and near future perspectives;Ahrenfeldt;Appl. Therm. Eng.,2011
2. Phosphorus vulnerability: a qualitative framework for assessing the vulnerability of national and regional food systems to the multidimensional stressors of phosphorus scarcity;Cordell;Global Environ. Change,2014
3. Dall, O., Gammelby, L., Wenzel, H., 2009. Klimaregnskab og Carbon Footprint Beregning for Kommunekemi a/s. (in Danish).
4. DANVA, 2009. Håndtering af spildevandsslam: Katalog over metoder til behandling og slutdisponering. Dansk Vand og Spildevandforening, Vejledning Nr. 82. (in Danish).
5. De Klein, C., Novoa, R.S.A., Ogle, S., Smith, K.A., Rochette P. Wirth, 2006. Guidelines for National Greenhouse Gas Inventories IPCC.