Discovery of a bipolar X-ray jet from the T Tauri star DG Tauri M. Güdel, S. L. Skinner, M. Audard, K. R. Briggs and S. Cabrit A&A, 478 3 (2008) 797-807 Published online: 12 December 2007 DOI: 10.1051/0004-6361:20078141