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Submitted on: 10 March 2010.
Revised on: 21 June 2010.
Accepted on: 14 July 2010.
___________________ANNALS OF FOREST SCIENCE---SPRINGER FRANCE
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Submitted on: 09 January 2003.
Revised on: 31 March 2003.
Accepted on: 17 April 2003.
___________________ANNALS OF FOREST SCIENCE---SPRINGER FRANCE