References for the numbering systems

Col	Reference

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R1 Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. 20, 155

R2 Forbes D., Dupuy D.L. 1978, Astron. J. 83, 266

R3 Barbon R., et al. 2000, Astron. Astrophys. Suppl. 144, 451

R4 McSwain M.V., Gies D.R., 2005, ApJS 161, 118


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