Stansberry, J. et al. (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". In Barucci, M. A. et al. The Solar System Beyond Neptune.University of Arizona Press. pp. 161–179. arXiv:astro-ph/0702538 ; Bibcode:2008ssbn.book..161S
Stansberry, J. et al. (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". In Barucci, M. A. et al. The Solar System Beyond Neptune.University of Arizona Press. pp. 161–179. arXiv:astro-ph/0702538 ; Bibcode:2008ssbn.book..161S