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	Barbon R. 1969, Mem. Astr. Soc. Italia 40, 45

R4	Jerzykiewicz M., et al. 1996, Acta Astr. 46, 253

R5	Balog Z., et al. 2001, Mon. Not. R. Astron. Soc. 323, 872

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