A local time-stepping Discontinuous Galerkin algorithm for the MHD system Christoph Altmann, Thomas Belat, Michael Gutnic, Philippe Helluy, Hélène Mathis, Éric Sonnendrücker, Wilfredo Angulo and Jean-Marc Hérard ESAIM: Proc., 28 (2009) 33-54 Published online: 23 November 2009 DOI: 10.1051/proc/2009038