Stellar metallicity of star-forming galaxies at z ~ 3 V. Sommariva, F. Mannucci, G. Cresci, R. Maiolino, A. Marconi, T. Nagao, A. Baroni and A. Grazian A&A, 539 (2012) A136 Published online: 06 March 2012 DOI: 10.1051/0004-6361/201118134