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3. Electricity End-Use Efficiency;International Energy Agency,1989
4. State of the Art: Lighting;Lovins,1988
5. Erichsen, P., Statistisk Bearbejdning af Salget af Sparepærer i NESA's Kampagne, Processing the Statistics on Sales of Energy-Efficienty Lamps in NESA's Campaign, Report UD 1990-33, NESA, Hellerup, Denmark