This paper presents 50 QSOs discovered on objective prism plates taken with the UK Schmidt and confirmed with slit spectra from various telescopes. Only three of these QSOs have been reported previously. The redshifts range from 2.5 to 3.3 with |z3.0| for 18 of them. Five of the objects are BAL QSOs and another five have some of the characteristics of the BALs such as a sharp blue edge on the NV or OVI emission line accompanied by heavy continuum absorption shortward of the Lyα+N V emission, or Lyα+N V emission dominated by N V which is as strong as C IV. All these phenomena imply higher ionization than typical QSO absorption lines, and from the similarities with the BAL QSOs suggest that the absorption is intrinsic to the QSO. We refer to the entire class as high-ionization absorption QSOs (HIA QSOs).
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Hazard et al. (1986) studied this question.