GD 552: a cataclysmic variable with a brown dwarf companion? - Unda-Sanzana, E.; Marsh, T. R.; Gänsicke, B. T.; Maxted, P. F. L.; Morales-Rueda, L.; Dhillon, V. S.; Thoroughgood, T. D.; Tremou, E.; Watson, C. A.; Hinojosa-Goñi, R. (Monthly Notices of the Royal Astronomical Society, 2008)