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	Ponomareva G.A. 1983, Trudy Gosud. Astr. Inst. Shterneberga LIII, 29

R4	Lattanzi M.G., et al. 1991, Astron. J. 102, 177

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