The authors would like to correct the acknowledgements of this article [1] as follows:
Acknowledgments
The authors thank the Portuguese National Science and Technology Foundation for funding this work with projects PTDC/ENR/73345/2006 and PTDC/SEN-ENR/115974/2009, and the University of Algarve for the Ceratonia 2008 Award. The first author thanks the European Commission for the grant PERG-GA-2008-239451.
The authors would like to apologize for any inconvenience this may have caused to the readers.
Reference
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