References for the numbering systems

Col	Reference

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R1 Becker W., et al, 1976, Basle Katalogue ...

R2 Zug R.S. 1937, Lick Obs. Bull. 18, 89

R3 Kjeldsen H., Frandsen S. 1991, Astron. Astrophys. Suppl. 87, 119

R4 Carraro G., et al., 2005, Astron. J. 130, 635

R5 Odell A.P. 2014, Astron. J. 147, 7


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