References for the numbering systems

Col	Reference

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

R1	Yadav R.K.S., sSagar R. 2004, Mon. Not. R. Astron. Soc. 351, 667

R2	Babu G.S.D. 1983, J. Astrophys. Astr. 4, 235

R3	Ramsay G., Pollaco D.L. 1992, Astron. Astrophys. Suppl. 94, 73

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