References for the numbering systems

Col	Reference

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

R1	Piatti, A.E., Claria J.J., Bica E. 2000, Astron. Astrophys. 360, 529

R2	Moffat A.F.J., Vogt N. 1973, Astron. Astrophys. Suppl. 10, 135

R3	McSwain M.V., Gies D.R., 2005, ApJS 161, 118

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