Rotation period and magnetic field morphology of the white dwarf WD 0009+501 G. Valyavin, S. Bagnulo, D. Monin, S. Fabrika, B.-C. Lee, G. Galazutdinov, G. A. Wade and T. Burlakova A&A, 439 3 (2005) 1099-1106 Published online: 12 August 2005 DOI: 10.1051/0004-6361:20052642