Magnetic Doppler imaging of the roAp star HD 24712 T. Lüftinger, O. Kochukhov, T. Ryabchikova, N. Piskunov, W. W. Weiss and I. Ilyin A&A, 509 (2010) A71 Published online: 21 January 2010 DOI: 10.1051/0004-6361/200811545