PHL 5038: a spatially resolved white dwarf brown dwarf binaryP. R. Steele, M. R. Burleigh, J. Farihi, B. T. Gänsicke, R. F. Jameson, P. D. Dobbie and M. A. BarstowA&A, 500 3 (2009) 1207-1210DOI: https://doi.org/10.1051/0004-6361/200911694