AD Leonis: Flares observed by XMM-Newton and Chandra E. J. M. van den Besselaar, A. J. J. Raassen, R. Mewe, R. L. J. van der Meer, M. Güdel and M. Audard A&A, 411 3 (2003) 587-593 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20031398