References for the numbering systems

Col	Reference

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R1	Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. Suppl. 20,125

R2	Moffat A.F.J., Shara M.M., Potter M. 1991, Astron. J. 102, 642 (no + 1000)

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