By Goumas M.   Lygerou V.   in European Journal of Operational Research

ISSN:0377-2217|123|3|606-613

Elsevier‎(2000)‎

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By Goumas M.G.   Lygerou V.A.   Papayannakis L.E.   in Energy Policy

ISSN:0301-4215|27|3|147-154

Elsevier‎(1999)‎

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