References for the numbering systems

Col	Reference

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

R1	Moffat A.F.J., Vogt N. 1973, Astron. Astrophys. Suppl. 10, 135

R2	Forbes D., Short S. 1996, Astron. J. 111, 1609

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

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