By Sistani K. R.   Adeli A.   Brink G E   Tewolde H.   Rowe D. E.   in Journal of Sustainable Agriculture

ISSN:1044-0046|24|1|25-35

Haworth Press‎(2004)‎

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By Schreuder H. T.   Brink G. E.   Wilson R. L.   in Forest Science

ISSN:0015-749X|30|3|803-812

Society of American Foresters‎(1984)‎

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