References for the numbering systems

Col	Reference

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

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	FitzGerald M.P., et al. 1990, Astron. J. 102, 865

R4	Lim B., et al. 2011, J. Korean Astron. Soc. 44, 39 

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