References for the numbering systems

Col	Reference

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

R1	Piatti A.E., Claria J.J. 2001, Astron. Astrophys. 370, 931

R2	Feinstein A. 1971, Publ. Astr. Soc. Pacific 83,218

R3	Moffat A.F.J. 1974, Astron. Astrophys. 34, 29

R4	Muzzio J.C., et al. 1974, Publ. Astron. soc. Pacific 86, 394 (field 2)

R5	Muzzio J.C., et al. 1976, Publ. Astron. soc. Pacific 88, 526 (field 2)

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