Discovery of seven ZZ Ceti stars using a new photometric selection method B. Voss, D. Koester, R. Østensen, S. O. Kepler, R. Napiwotzki, D. Homeier and D. Reimers A&A, 450 3 (2006) 1061-1070 Published online: 19 April 2006 DOI: 10.1051/0004-6361:20054227