Two quasars of virtually identical redshift separated by 9.5" have been discovered on a CFHT grens plate. Subsequent spectroscopy reveals substantial differences in their spectral line strengths which appear to be incompatible with a gravitational lens hypothesis. Furthermore, deep CCD images of the field do not show any indication of a lensing galaxy or extended Lyα emission. It is likely that these quasars are a physically related pair, possibly residing in a cluster of galaxies at z = 2.03.
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Crampton et al. (1988) studied this question.