References for the numbering systems

Col	Reference

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

R1	Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. Suppl. 7, 133

R2	McSwain M.V., Gies D.R. 2005, ApJS 161, 118

R3	Delgado A.J. et al. 2007, Astron. Astrophys. 467, 1397 

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