We would like to thank David Garfinkle for a critical reading of the manuscript and the Louisiana State University for hospitality while this work was begun. JMM was supported by the I3P framework of CSIC and the European Social Fund, and by the Spanish MEC Project FIS2005-05736-C03-02.
For the 2010 revision, JMM was supported by the French A.N.R. (Agence Nationale de la Recherche) through Grant BLAN07-1_201699 entitled “LISA Science”, and CG was supported by the A.N.R. Grant 06-2-134423 entitled “Mathematical Methods in General Relativity”. CG would also like to thank the IAP and LUTH for hospitality.
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