By Fjellstad W. J.   Dramstad W. E.   Strand G.-H.   Fry G. L. A.   in Norwegian Journal of Geography

ISSN:0029-1951|55|2|71-76

Routledge Ltd‎(2001)‎

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By Dramstad W.E.   Fjellstad W.J.   Strand G.   Mathiesen H.F.   Engan G.   Stokland J.N.   in Journal of Environmental Management

ISSN:0301-4797|64|1|49-63

Academic Press‎(2002)‎

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