Barucci M.A., Merlin, Guilbert, Bergh i inni. Surface composition and temperature of the TNO Orcus. „Astronomy and Astrophysics”. 479 (1), s. L13–L16, 2008. DOI: 10.1051/0004-6361:20079079. Bibcode: 2008A&A...479L..13B. (ang.).
Barucci M.A., Merlin, Guilbert, Bergh i inni. Surface composition and temperature of the TNO Orcus. „Astronomy and Astrophysics”. 479 (1), s. L13–L16, 2008. DOI: 10.1051/0004-6361:20079079. Bibcode: 2008A&A...479L..13B. (ang.).