X-ray monitoring of optical novae in M 31 from July 2004 to February 2005 W. Pietsch, F. Haberl, G. Sala, H. Stiele, K. Hornoch, A. Riffeser, J. Fliri, R. Bender, S. Bühler, V. Burwitz et al. (2 more) A&A, 465 2 (2007) 375-392 Published online: 02 January 2007 DOI: 10.1051/0004-6361:20066812