References for the numbering systems

Col	Reference

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

R1	Phelps R.L., Janes K.A. 1994, ApJS 90, 31

R2	Forbes D. 1981, Publ. Astron. Soc. Pacific 93,441

R3	Sharma S. et al., 2006, Astron. J. 132, 1669

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