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http://dx.doi.org/10.4067/S0365-28072007000400005DOI Link
http://www.scielo.cl/scielo.php?script=sci_arttext[...]07/18/2011Item is within a limited-access website
http://www.scielo.cl/pdf/agrtec/v67n4/at05.pdf07/18/2011PDF ReaderItem is within a limited-access website