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R3 Zug R.S. 1933, Lick Obs. Bull. 16, 119
R4 Lavdovski V.V. 1961, Trudy Glavn. Astr. Obs. 73, 1
R5 Hintz E.G., Rose M.B. 2005, Publ. Astron. Soc. Pacific 117, 955
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