The influence of chemical composition on the properties of Cepheid stars - II. The iron contentM. Romaniello, F. Primas, M. Mottini, S. Pedicelli, B. Lemasle, G. Bono, P. François, M. A. T. Groenewegen and C. D. LaneyA&A, 488 2 (2008) 731-747DOI: https://doi.org/10.1051/0004-6361:20065661