Bright metal-poor variables: Why “Anomalous” Cepheids? F. Caputo, V. Castellani, S. Degl'Innocenti, G. Fiorentino and M. Marconi A&A, 424 3 (2004) 927-934 Published online: 06 September 2004 DOI: 10.1051/0004-6361:20040307