References for the numbering systems

Col	Reference

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

R1	Kaluzny J. 1989, Acta Astr. 39, 13

R2	Aparicio A., et al. 1993, Astron. J. 106, 547

R3	Sagar R., Griffiths W.K. 1998, Mon. Not. R. Astr. Soc. 299, 1

R4	Kopacki G., et al. 2008, Acta Astr. 58, 373

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