Optical luminosity functions of the Abell galaxy cluster ABCG 209 at z = 0.21 A. Mercurio, M. Massarotti, P. Merluzzi, M. Girardi, F. La Barbera and G. Busarello A&A, 408 1 (2003) 57-65 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20030971