J. Stansberry et al. (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". arΧiv:astro-ph/0702538 [astro-ph].
P. Lacerda, D. Jewitt (2006). "Densities Of Solar System Objects From Their Rotational Lightcurve". arΧiv:astro-ph/0612237 [astro-ph].