Col Reference--- ---------
R1 Yilmaz F. 1966, Z. Astrophys. 64, 54
R2 Hoag A.A., et al. 1961, Publ. US Nav. Obs. 17, 347 pe
R3 Hoag A.A., et al. 1961, Publ. US Nav. Obs. 17, 347 pg
R4 Apriamashvili S.P. 1962, Bull. Abastumani Obs. 29, 157
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