S. P. Driver, A. Fernandez-Soto, W. J. Couch, S. C. Odewahn, R. A. Windhorst, S. Phillips, K. Lanzetta, A. Yahil (1998). "Morphological Number Counts and Redshift Distributions to I<26 from the Hubble Deep Field: Implications for the Evolution of Ellipticals, Spirals, and Irregulars". Astrophysical Journal496 (2): L93–L96. doi:10.1086/311257. Bibcode: 1998ApJ...496L..93D.
R. S. Priddey, R. G. McMahon (2001). "The far-infrared-submillimetre spectral energy distribution of high-redshift quasars". Monthly Notices of the Royal Astronomical Society324 (1): L17–L22. doi:10.1046/j.1365-8711.2001.04548.x. Bibcode: 2001MNRAS.324L..17P.
S. P. Driver, A. Fernandez-Soto, W. J. Couch, S. C. Odewahn, R. A. Windhorst, S. Phillips, K. Lanzetta, A. Yahil (1998). "Morphological Number Counts and Redshift Distributions to I<26 from the Hubble Deep Field: Implications for the Evolution of Ellipticals, Spirals, and Irregulars". Astrophysical Journal496 (2): L93–L96. doi:10.1086/311257. Bibcode: 1998ApJ...496L..93D.
R. S. Priddey, R. G. McMahon (2001). "The far-infrared-submillimetre spectral energy distribution of high-redshift quasars". Monthly Notices of the Royal Astronomical Society324 (1): L17–L22. doi:10.1046/j.1365-8711.2001.04548.x. Bibcode: 2001MNRAS.324L..17P.