Oxygen abundances in the Galactic bulge: evidence for fast chemical enrichment M. Zoccali, A. Lecureur, B. Barbuy, V. Hill, A. Renzini, D. Minniti, Y. Momany, A. Gómez and S. Ortolani A&A, 457 1 (2006) L1-L4 Published online: 12 September 2006 DOI: 10.1051/0004-6361:20065659