THE FIRST–2MASS RED QUASAR SURVEY. II. AN ANOMALOUSLY HIGH FRACTION OF LoBALs IN SEARCHES FOR DUST-REDDENED QUASARS*, Tanya Urrutia, Robert H. Becker, Richard L. White, Eilat Glikman, Mark Lacy, Jacqueline Hodge, Michael D. Gregg
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A 2009 study studied this question.
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