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"spec. type (Tholen) is defined". JPL Small-Body Database Search Engine. JPL. Erişim tarihi: 26 Aralık 2021.Arşivlenmesi gereken bağlantıya sahip kaynak şablonu içeren maddeler (link)
"spec. type (Tholen) = M". JPL Small-Body Database Search Engine. JPL. Erişim tarihi: 26 Aralık 2021.Arşivlenmesi gereken bağlantıya sahip kaynak şablonu içeren maddeler (link)
Coradini, A.; ve diğerleri. (2011). "The surface composition and temperature of asteroid 21 Lutetia as observed by Rosetta/VIRTIS". Science. 334 (492). ss. 492-494. doi:10.1126/science.1204062. PMID22034430.