References for the numbering systems

Col	Reference

---	---------

R1	Lindoff U. 1968, Ark. Astr. 4, 587

R2	Claria J.J. 1976, Publ. Astr. Soc. Pacific 88, 225

R3	Kilambi G.C. 1978, Publ. Astron. Soc. Pacific 90, 721

R4	Giorgi E.E., et al. 2002, Astron. Astrophys. 381, 884

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

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