Mass-metallicity relation of zCOSMOS galaxies at z ≈ 0.7, its dependence on star formation rate, and the existence of massive low-metallicity galaxiesC. Maier, B. L. Ziegler, S. J. Lilly, T. Contini, E. Pérez-Montero, F. Lamareille, M. Bolzonella and E. Le Floc’hA&A, 577 (2015) A14DOI: https://doi.org/10.1051/0004-6361/201425224