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Reddening-independent quasar selection from a wide-field op..:

Sharp, R. G. ; Sabbey, C. N. ; Vivas, A. K....
Monthly Notices of the Royal Astronomical Society.  337 (2002)  3 - p. 1153-1162 , 2002
Link: https://doi.org/10.1046/j.1365-8711.2002.05961.x