Magnetism and Synchrotron Radiation: Towards the Fourth Generation Light Sources Proceedings of the 6th International School “Synchrotron Radiation and Magnetism”, Mittelwihr (France), 2012 - Beaurepaire, Eric; Bulou, Hervé; Joly, Loic; Scheurer, Fabrice (Springer International Publishing : Imprint: Springer, 2013)