References for the numbering systems

Col	Reference

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

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

R2	Vazquez R.A., et al. 1997, Astron. Astrophys. Suppl. 124, 13

R3	Paunzen E., et al. 2002, Astron. Astrophys. 395, 823

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

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