On the metallicity gradient of the Galactic disk S. Pedicelli, G. Bono, B. Lemasle, P. François, M. Groenewegen, J. Lub, J. W. Pel, D. Laney, A. Piersimoni, M. Romaniello et al. (8 more) A&A, 504 1 (2009) 81-86 Published online: 23 June 2009 DOI: 10.1051/0004-6361/200912504