Star formation activity of intermediate redshift cluster galaxies out to the infall regions B. Gerken, B. Ziegler, M. Balogh, D. Gilbank, A. Fritz and K. Jäger A&A, 421 1 (2004) 59-70 Published online: 11 June 2004 DOI: 10.1051/0004-6361:20041222