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Acknowledgements
We gratefully acknowledge the financial support from MICINN-
Spain, project CTQ2008-01402 and Fundacio´n Se´neca (Agencia
de Ciencia y Tecnolog´ıa de la Regio´n de Murcia), project
04509/GERM/06 (Programa de Ayudas a Grupos de Excelencia
de la Regio´n de Murcia, Plan Regional de Ciencia y Tecnolog´ıa
2007/2010). We also wish to thank the Supercomputation Center
at “Fundacio´n Parque Cient´ıfico de Murcia” (FPCMur) for their
technical support and the computational resources used in the
supercomputer Ben-Arab´ı.
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˚
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