References for the numbering systems

Col	Reference

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

R1	Moffat A.F.J., Fitzgerald M.P. 1974, Astron. Astrophys. Suppl. 16,25

R2	Sagar R., et al. 2001 Mon. Not. R. Astron. Soc. 327, 23

R3	Paunzen E., et al. 2005, Astron. Astrophys. 443, 157

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