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	Ishmukamedov K.Z. 1967, Tsirk. Astr. Obs. Tashkent no 347

R5	Hoppmann J. 1958, Mitt. Univ. Sternw. Wien 8 no 13

R6	Zug R.S. 1933, Lick Obs. Bull. 16, 119

R7	Purgathofer A. 1964, Ann. Univ. Sternw. Wien 26 no 2

R8	Dombrowski W.A., Hagen-Thorn W.A. 1964, Publ.Astr.Obs.Univ.Lenin. 20,

R9	Paunzen E., et al. 2005, Astron. Astrophys. 443, 157

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