References for the numbering systems

Col	Reference

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

R1	Grubissich C. 1968, Z. Astrophys. 68,173

R2	Carraro G. 2002, Mon. Not. R. Astron. Soc.

R3	Tapia M., et al. 2003, Mon. Not. R. Astron. Soc. 339, 44

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