References for the numbering systems

Col	Reference

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

R1	Paunzen E., et al. 2006, Astron. Astrophys. 454, 171

R2	Vogt N., Moffat A.F.J. 1972, Astron. Astrophys. Suppl. 7, 133 

R3	Carraro G., et al. 2013, Mon. Not. R. Astron. Soc. 428, 502 

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