Michael J. Kurtz; Ostriker E. C.; Huchra J. P.; Geller M. J. (). „The kinematics and dynamics of the rich cluster of galaxies Abell 539”. Astronomical Journal. 96: 1775–1790. Bibcode:1988AJ.....96.1775O. doi:10.1086/114928. WikidataQ66649136.
Michael J. Kurtz; Ostriker E. C.; Huchra J. P.; Geller M. J. (). „The kinematics and dynamics of the rich cluster of galaxies Abell 539”. Astronomical Journal. 96: 1775–1790. Bibcode:1988AJ.....96.1775O. doi:10.1086/114928. WikidataQ66649136.
Michael J. Kurtz; Ostriker E. C.; Huchra J. P.; Geller M. J. (). „The kinematics and dynamics of the rich cluster of galaxies Abell 539”. Astronomical Journal. 96: 1775–1790. Bibcode:1988AJ.....96.1775O. doi:10.1086/114928. WikidataQ66649136.