@article{Romaniello:2888,
      author        = "Romaniello, M. and  Primas, F. and  Mottini, M. and 
                       Pedicelli, S. and  Lemasle, B. and  Bono, G. and 
                       François, P. and  Groenewegen, M. A. T. and  Laney, C. D.",
      title         = "{The Dependency of the Cepheid Period-Luminosity Relation
                       on Chemical Composition}",
      year          = "2009",
}