References for the numbering systems

Col	Reference

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R1 Turbide L., Moffat A.F.J. 1993, Astron. J. 105, 1831

R2 Munari U., Carraro G. 1995, Mon. Not. R. Astron. Soc. 277, 1269

R3 Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. Suppl. 20,85


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