References for the numbering systems

Col	Reference

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R1 Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. Suppl. 20,85

R2 Harris G.L.H., van den Bergh S. 1976, Astron. J. 209, 130

R3 Walker A.R. 1987, Mon. Not. R. Astr. Soc. 229, 31

R4 Topatkas L. 1981, Astron. Astrophys. Suppl. 45, 111

R5 McSwain M.V., Gies D.R., 2005, ApJS 161, 118


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