References for the numbering systems

Col	Reference

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

R1	Piatti A.E. et al. 1998, Astron. J. 116, 801

R2	Moffat A.F.J., Vogt N. 1973, Astron. Astrophys. Suppl. 10, 135

R3	Tadross A.L. 2008, New Astronomy 13, 370

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