References for the numbering systems

Col	Reference

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

R1	Yadav R.K.S., Sagar R. 2002, Mon. Not. R. Astron. Soc. 337, 133

R2	Jackson P.A., et al. 1980, Astron. Astrophys. Suppl. 41, 211

R3	Paunzen E., et al. 2006, Astron. Astrophys. 454, 171

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