XMM–Newton observations of the ultraluminous nuclear X-ray source in M 33 L. Foschini, J. Rodriguez, Y. Fuchs, L. C. Ho, M. Dadina, G. Di Cocco, T. J.-L. Courvoisier and G. Malaguti A&A, 416 2 (2004) 529-536 Published online: 27 February 2004 DOI: 10.1051/0004-6361:20034303