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Submitted on: 20 May 2002.
Revised on: 10 August 2002.
Accepted on: 07 September 2002.
___________________Ecosistemas y Recursos Agropecuarios
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Submitted on: 21 December 2015.
Revised on: 12 April 2016.
Accepted on: 10 May 2016.
___________________Ecosistemas y Recursos Agropecuarios