References for the numbering systems

Col	Reference

---	---------

R1	Hoag A.A., et al. 1961, Pub. US. N. Obs. 17, 347   (Pe)

R2	Hoag A.A., et al. 1961, Pub. US. N. Obs. 17, 347   (Pg)

R3	Zug R.S. 1933, Lick Obs. Bull. 16, 119

R4	Forbes D. 1996, Astron. J. 112, 1073

R5	Park B.-G., Sung H., Kang Y.H. 2001, J. Korean Astron. Soc. 34, 149

R6	McSwain M.V., Gies D.R., 2005, ApJS 161, 118

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