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References
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Burbidge, G. R., Crowne, A. H. & Smith, H. E. Astrophys. J. Suppl. 33, 113–188 (1977).
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Hawkins, M. R. S. & Stewart, N. J. (in preparation).
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STEWART, N., HAWKINS, M. The cosmological evolution of QSOs (reply). Nature 281, 406 (1979). https://doi.org/10.1038/281406a0
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DOI: https://doi.org/10.1038/281406a0