References for the numbering systems

Col	Reference

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

R1	Subramanian A., Sagar R. 1999, Astron. J 117, 937

R2	Vogt N., Moffat A.F.J. 1972, Astron. Astrophys. Suppl. 7, 133

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

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