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	Zakharova P.E. 1986, Invest. Astr. Geod. Urals Univ. p. 134

R4	Celeste Parisi M., et al. 2005, Mon. Not. R. Astron. Soc. 363, 1247

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