References for the numbering systems

Col	Reference

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

R1	Munari U., et al. 1998, Mon. Not. R. Astron. Soc. 297, 867

R2	FitzGerald M.P., Moffat A.F.J. 1974, Astron. J. 79, 873

R3	Labhardt L., et al. 1992, Astron. Astrophys. 265, 869

R4	Vézquez R.A., et al. 2010, Astron. Astrophys. 511, A38 

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