References for the numbering systems

Col	Reference

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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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