By Parviainen Jari A.   Schadewitz Hannu J.   Blevins Dallas R.   in Applied Economics Letters

ISSN:1466-4291|8|11|747-750

Routledge Ltd‎(2001)‎

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By Parviainen Jari   in Journal of Forestry

ISSN:0022-1201|92|9|33-36

Society of American Foresters‎(1994)‎

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