References for the numbering systems

Col	Reference

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R1 Vogt N., Moffat A.F.J. 1972, Astron. Astrophys. Suppl. 7, 133

R2 Zug R.S. 1933, Lick Obs. Bull. 16, 119

R3 Hassan S.M. 1984, Astron. with Schmidt-type telesc. p. 295

R4 Subramaniam A., Sagar R. 1999, Astron. J 117, 937

R5 McSwain M.V., Gies D.R., 2005, ApJS 161, 118


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