References for the numbering systems

Col	Reference

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

R1	Carraro G., Munari U. 2004, Mon. Not. R. Astron. Soc. 347, 625

R2	Claria J.J. 1979, Observatory 99,202

R3	Giorgi E.E., et al. 2005, Astron. Astrophys. 432, 491

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