Żytkow, Anna; Irwin, Mike; Tremaine, Scott (1995). "A Search for Slow-Moving Objects and the Luminosity Function of the Kuiper Belt". The Astronomical Journal. 110. Institute of Astronomy, Madingley Road, Cambridge, United Kingdom: 3082. Bibcode:1995AJ....110.3082I. doi:10.1086/117749.
Żytkow, Anna; Irwin, Mike; Tremaine, Scott (1995). "A Search for Slow-Moving Objects and the Luminosity Function of the Kuiper Belt". The Astronomical Journal. 110. Institute of Astronomy, Madingley Road, Cambridge, United Kingdom: 3082. Bibcode:1995AJ....110.3082I. doi:10.1086/117749.