References for the numbering systems

Col	Reference

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

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

R2	Turner D.G. 1985, Astrophys. J. 292.148

R3	Vazquez R.A., et al. 2005, Astron. Astrophys. 430, 471 (No + 1000)

R4	Paunzen E., et al. 2005, Astron. Astrophys. 443, 157

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