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seds.org
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Messier 93. SEDS Messier Catalog. [30 April 2022]. (原始内容存档于2023-06-04).
Frommert, Hartmut; Kronberg, Christine, Messier 93, SEDS Messier pages (Students for the Exploration and Development of Space (SEDS)), September 2, 2007 [2018-12-07], (原始内容存档于2018-10-14).