References for the numbering systems

Col	Reference

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

R1	Tosi M., et al. 1998, Mon. Not. R. Astron. Soc. 299, 834

R2	Phelps R.L., et al. 1994, Astron. J. 107, 1079

R3	Christian C.A., Janes K.A. 1979, Astron. J. 84, 204

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