References for the numbering systems

Col	Reference

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

R1	Seggewiss W. 1967, Thesis (Univ. Munster)

R2	Moffat A.F.J., Vogt N. 1973, Astron. Astrophys. Suppl. 10, 135

R3	Piatti A.E., et al. 1998, Astrophys. J. Suppl. 116, 263

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