References for the numbering systems

Col	Reference

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

R1	Fenkart R.P., Schroder A. 1985, Astron. Astrophys. Suppl. 59, 83

R2	Grubissich C. 1965, Z. Astrophys. 60, 256

R3	Glushkova E.V., et al. 2010, Astron. Lett. 36, 14 

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