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2by Ahonen, Ulla, Heinonen-Tanski, HelviGet access
Published in Acta Agriculturae Scandinavica, Section B - Soil & Plant Science (1994)
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3by Niemi, Karoliina, Salonen, Maija, Ernstsen, Arild, Heinonen-Tanski, Helvi, Häggman, HelyGet access
Published in Canadian Journal of Forest Research (2000)
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Article in Journal/Newspaper