References for the numbering systems

Col	Reference

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R1 Moffat A.F.J., Vogt N. 1975, Astron. Astrophys. Suppl. 20, 155

R2 Lynga G. 1977, Astron. Astrophys. 54, 311

R3 Madore B.F. 1975, Astron. Astrophys. 38, 471

R4 van den Bergh S., Harris G.L.H. 1976, Astrophys. J. 208, 765

R5 Walker A. 1985, Mon. Not. R. Astr. Soc. 213, 889


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