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1987Natur.325..131W - Nature, 325, 131-132 (1987)
First observation of a quasar with a redshift of 4.
WARREN S.J., HEWETT P.C., IRWIN M.J., McMAHON R.G., BRIDGELAND M.T., BUNCLARK P.S. and KIBBLEWHITE E.J.
Journal keyword(s):
Simbad objects: 1
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