GB 1508+5714 : a radio-loud quasar with Z = 4.30 and the space density of high-redshift, radio-loud quasars.
Journal article published in 1995 by
I. M. Hook,
R. G. McMahon 
,
A. R. Patnaik,
I. W. A. Browne,
P. N. Wilkinson,
M. J. Irwin,
C. Hazard
,
A. R. Patnaik,
I. W. A. Browne,
P. N. Wilkinson,
M. J. Irwin,
C. Hazard
