Discovery of a cluster of galaxies behind the Milky Way: X-ray and optical observationsR. Lopes de Oliveira, G. B. Lima Neto, C. Mendes de Oliveira, E. Janot-Pacheco and C. MotchA&A, 459 2 (2006) 415-422DOI: https://doi.org/10.1051/0004-6361:20065681