References for the numbering systems

Col	Reference

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R1 Fenkart R.P., et al. 1977, Astron. Astrophys. Suppl. 30,307

R2 Vazquez R.A., Feinstein A. 1991, Astron. Astrophys. Suppl. 90, 317

R3 Moffat A.F.J., Vogt N. 1973, Astron. Astrophys. Suppl. 10, 135

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


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