By van den Broek R.   Lemmens L.   in Energy Policy

ISSN:0301-4215|25|1|43-54

Elsevier‎(1997)‎

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By Devreese J.T.   Brosens F.   Lemmens L.F.   in Foundations of Physics

ISSN:0015-9018|31|1|41-55

Springer Publishing Company ‎(2001)‎

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