1. SEA, Energy in Sweden 2000, Swedish Energy Agency, Eskilstuna, Sweden
2. SDHA, Statistics 2000, Swedish District Heating Association, Stockholm, Sweden
3. A. Gebremedhin, The impact of a widened energy system boundary on cost effectiveness, LiU-TEK-LIC-2000:826, Linköpings Universitet, Sweden, 2000
4. L. Backlund, Optimisation of dynamic energy systems with time dependent components and boundary conditions, Linköping Studies in Sciences and Technology Dissertations No. 181, Linköpings Universitet, Sweden, 1988
5. D. Henning, Optimisation of local and national energy systems––development and use of the MODEST model, Linköping Studies in Sciences and Technology, Dissertations No. 559, Linköpings Universitet, Sweden, 1999