References for the numbering systems

Col	Reference

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

R1	Lindoff U. 1966, Ark. Astr. 4,305

R2	Piatti A. E., et al. 1999, Mon. Not. R. Astron. Soc. 303, 65

R3	Paunzen E., et al. 2006, Astron. Astrophys. 454, 171

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