References for the numbering systems

Col	Reference

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

R1	Fenkart R.P. 1965, Z. Astrophys. 62, 90

R2	Delgado A.J. et al. 1997, Astron. J. 113, 713 (No + 1000)

R3	Grubissich C. 1965, Z. Astrophys. 60, 249

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

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