1. Temperature and Precipitation in Sweden 1961–1990. Reference Normals;Alexandersson,1990
2. Anonymous, 1995. Miljörapport enligt miljöskyddslagen. Reningsverket Haga. KommunalTeknik AB, Surahammar, Sweden, 1995.
3. Bengtsson M, Lundin M, Molander S. Life cycle assessment of wastewater systems, case studies of conventional treatment, urine sorting and liquid composting on three municipalities. Technical Environmental Planning. Chalmers University of Technology. Göteborg, Sweden, 1997.
4. Brown MT, Odum HT, McGrane G, Woithe RD, Lopez S, Bastianoni, S. Emergy evaluation of energy policies for Florida. Report to the Florida Energy Office. Center for Environmental Policy, Department of Environmental Engineering Sciences, University of Florida, Gainesville, FL, 1995.
5. Buranakarn V. Evaluation of recycling and reuse of building materials using the emergy analysis method. Dissertation. University of FLorida, Gainesville, 1998.