An analysis of STIS HST UV spectra of M 33 early B supergiants M. A. Urbaneja, A. Herrero, R. P. Kudritzki, F. Bresolin, L. J. Corral and J. Puls A&A, 386 3 (2002) 1019-1027 Published online: 15 May 2002 DOI: 10.1051/0004-6361:20020349