Discovery of a magnetic field in the Slowly Pulsating B star ζ Cassiopeiae C. Neiner, V. C. Geers, H. F. Henrichs, M. Floquet, Y. Frémat, A.-M. Hubert, O. Preuss and K. Wiersema A&A, 406 3 (2003) 1019-1031 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20030742