References for the numbering systems

Col	Reference

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R1	Moffat A.F.J., FitzGerald M.P. 1974, Astr. Ap. Suppl. 18,1

R2	Mallik D.C.V, Sagar R., Pati A.K. 1995, Astr. Ap. Suppl. 114, 537

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