Gas-phase metallicity of 27 galaxies at intermediate redshift L. Morelli, V. Calvi, A. Cardullo, A. Pizzella, E. M. Corsini and E. Dalla Bontà A&A, 544 (2012) A74 Published online: 31 July 2012 DOI: 10.1051/0004-6361/201219316