References for the numbering systems

Col	Reference

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

R1	Carraro G., Patat F. 1995, MNRAS 276, 563

R2	Turner D.G. 1983, Jour. R. Astr. Soc. Canada 77,31

R3	Piatti A.E., et al. 2004, Astron. Astrophys. 421, 991

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