References for the numbering systems

Col	Reference

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

R1	Phelps R.L., Janes K.A. 1994, Astrophys. J. Suppl. 90, 31

R2	Frolov 

R3	Turner D.G. et al., 2008, Mon. Not. R. Astron. Soc. 388, 444

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