The periodic variations of a white-light flare observed with ULTRACAM M. Mathioudakis, D. S. Bloomfield, D. B. Jess, V. S. Dhillon and T. R. Marsh A&A, 456 1 (2006) 323-327 Published online: 23 August 2006 DOI: 10.1051/0004-6361:20054752