Abstract

This work was supported by MCYT and MEC of Spain (Grants MAT2002-04499-C02-01 and MAT2005-06544-C03-01), and by Junta de Castilla y Leon (Grant VA039A05).J.I.M. acknowledges support from the MEC under the F.P.I. graduate fellowship program and the hospitality of the Institut fur Theoretische Physik (Freie Universitat Berlin). J.A.A. and J.I.M. acknowledge the hospitality and support of the Donostia International Physics Center (DICP).A.C.ackno wledges support from the Sonderforschungsbereich 450 and the European Theoretical Spectroscopy Facility (ETSF).We were partially supported by the EC 6th Framework Network of Excellence NANOQUANTA (NMP4-CT-2004-500198).AR acknowledges the 2005 Bessel research award of the Humboldt Foundation.

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