References for the numbering systems

Col	Reference

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

R1	Sharov A.S. 1965, Soobsh. Gosudarst. Astron. Inst. Shternberga 1

R2	Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. Suppl. 20, 155

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

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