References for the numbering systems

Col	Reference

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

R1	Cuffey J. 1937, Ann. Harvard Coll. Obs. 105, 403

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

R4	Lavdovski V.V. 1961, Trudy Leningrad Astr. Obs. 73, 7

R5	Mathews R.T. 1963, Publ. Goodsell Obs. no 14

R6	Mills G.A. 1967, J. Obs. 50, 179

R7	Zug R.S. 1933, Lick Obs. Bull. 16, 119

R8	Subramaniam A., Sagar R. 1999, Astron. J 117, 937

R9	Pandey A.K., et al. 2007, Publ. Astron. Soc. Japan 59, 547

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