VGCF detection of galaxy systems at intermediate redshifts R. Barrena, M. Ramella, W. Boschin, M. Nonino, A. Biviano and E. Mediavilla A&A, 444 3 (2005) 685-695 Published online: 05 December 2005 DOI: 10.1051/0004-6361:20053449