Introducing BAX: A database for X-ray clusters and groups of galaxiesR. Sadat, A. Blanchard, J.-P. Kneib, G. Mathez, B. Madore and J. M. MazzarellaA&A, 424 3 (2004) 1097-1100DOI: https://doi.org/10.1051/0004-6361:20034029