Carvalho Margarida M , Castro Carlos Renato T, Yamaguchi Luiz Carlos T, Alvim Maurílio José, Freitas Vicente P and Ferreira Xavier Deise 2003: Two methods for the establishment of a silvopastoral system in degraded pasture land.
Livestock Research for Rural Development. Volume 15, Article #91.
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from http://www.lrrd.org/lrrd15/12/carv1512.htm