References for the numbering systems

Col	Reference

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R1 Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. Suppl. 20, 125

R2 Steppe H. 1977, Astron. Astrophys. Suppl. 27, 415

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


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