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Energy Conversion and Management > 1998 > 39 > 9 > 931-942
Energy Conversion and Management > 1997 > 38 > 9 > 919-930
Electric Power Systems Research > 1997 > 40 > 2 > 107-114
European Journal of Purchasing and Supply Management > 1996 > 2 > 2-3 > 119-127
International Journal of Electrical Power and Energy Systems > 1995 > 17 > 3 > 199-205