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ISSN:0140-9883|23|2|191-210

Elsevier‎(2001)‎

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By Hutton J.P.   Halkos G.E.   in Energy Economics

ISSN:0140-9883|17|4|259-275

Elsevier‎(1995)‎

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By Halkos G. E.   Georgiou M. N.   in Applied Financial Economics Letters

ISSN:1744-6546|1|5|293-296

Routledge Ltd‎(2005)‎

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