References for the numbering systems

Col	Reference

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R1 Hoag A.A., et al. 1961, Publ. US Nav. Obs. 17, 347 (pe)

R2 Hoag A.A., et al. 1961, Publ. US Nav. Obs. 17, 347 (pg)

R3 Janes K.A., Hoq S. 2011, Astron. J. 141, 92

R13 Voroshilov V.I., et al. 1969, Kiev. BV catalogue of 12000 stars


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