References for the numbering systems

Col	Reference

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

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

R2	Battinelli P., et al. 1992, Astron. J. 103, 1596

R3	Alter G. 1944, MNRAS 104, 179

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