References for the numbering systems

Col	Reference

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

R1	Ortolani S., Bica E., Barbuy B. 1995, Astron. Astrophys. 300, 726

R2	Gratton R.G., Ortolani S. 1988, Astron. Astrophys. Suppl. 74, 299

R3	Lee M.G. 1997, Astron. J. 113, 729

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