A deep XMM-Newton serendipitous survey of a middle-latitude area - II. New deeper X-ray and optical observationsG. Novara, N. La Palombara, R. P. Mignani, E. Hatziminaoglou, M. Schirmer, A. De Luca and P. A. CaraveoA&A, 501 1 (2009) 103-118DOI: https://doi.org/10.1051/0004-6361/200810618
