References for the numbering systems

Col	Reference

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

R1	Becker W. 1965, Mem. Astr. Soc. Italiana 36,277

R2	Barkhatova

R3	Mathews R.T. 1963, Publ. Goodsell Obs. no 14

R4	Frolov V.N. 1977, Izv. Glavn. Astron. Obs. Pulkove 195, 80

R5	Ishmukamedov K. 1966, Circ. Tashkent Astr. Obs. no 345

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