Constraints on stellar convection from multi-colour photometry of δ Scuti stars J. Daszyńska-Daszkiewicz, W. A. Dziembowski and A. A. Pamyatnykh A&A, 407 3 (2003) 999-1006 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20030947