References for the numbering systems

Col	Reference

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

R1	Fenkart R.P. 1968, Mem. Soc. Astr. Italiana 39, 85

R2	Hoag A.A., et al. 1961, Publ. US Nav. Obs. 17, 347  (pe)

R3	Hoag A.A., et al. 1961, Publ. US Nav. Obs. 17, 347  (pg)

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