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We present a new determination of the QSO luminosity function and its evolution based primarily on a large, complete catalogue of 420 faint (B20 mag), the number–magnitude relation for QSOs exhibits a departure from the steep power-law slope seen at brighter (B−23) QSOs in the survey. However, incompleteness in the original catalogue at these magnitudes may be responsible for this effect.
Boyle et al. (Thu,) studied this question.