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The work of A.D. is supported by the EU contract MRTN-CT-2004-005104. C.B., E.M.C., S.O.S. and S.C.S. acknowledge support from the type A grant 581/2007 with the Romanian National Council for Academic Scientific Research (C.N.C.S.I.S.) and the Romanian Ministry of Education, Research and Youth (M.E.C.T.).