References for the numbering systems

Col	Reference

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

R1	Purgathofer A. 1964, Ann. Univ. Sternw. Wien 26 no 2

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

R5	Lavdovski V.V. 1961, Trudy Leningrad Astr. Obs. 73, 7  (table l)

R6	Subramanian A., Sagar R. 1999, Astron. J 117, 937

R7	Purgathofer A. 1964, Ann. Univ. Sternw. Wien 26 no 2 (photoelectric se)

R8	Pandey A.K., et al. 2007, Publ. Astron. Soc. Japan 59, 547

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