An X-ray and optical study of the cluster A33 S. Colafrancesco, C. R. Mullis, A. Wolter, I. M. Gioia, T. Maccacaro, A. Antonelli, F. Fiore, J. Kaastra, R. Mewe, Y. Rephaeli et al. (4 more) Astron. Astrophys. Suppl. Ser., 144 2 (2000) 187-194 Published online: 15 June 2000 DOI: 10.1051/aas:2000205