VLT/ISAAC spectra of the Hβ region in intermediate redshift quasars J. W. Sulentic, G. M. Stirpe, P. Marziani, R. Zamanov, M. Calvani and V. Braito A&A, 423 1 (2004) 121-132 Published online: 29 July 2004 DOI: 10.1051/0004-6361:20035912