White dwarf-red dwarf binaries in the Sloan Digital Sky Survey - I. Sample definitionT. Augusteijn, R. Greimel, E. J. M. van den Besselaar, P. J. Groot and L. Morales-RuedaA&A, 486 3 (2008) 843-853DOI: https://doi.org/10.1051/0004-6361:20078584