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	Patat F., Carraro G. 2001, Mon. Not. R. Astron. Soc. 325, 1591 (no + 1000)

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