References for the numbering systems

Col	Reference

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

R1	Alksnis A. 1958, Trudy Astrophys. Lab. Riga 7, 33

R2	Marschall L.A., van Altena W.F. 1987, Astron. J. 94, 71

R3	Kun M. 1986, Astrophys. Space Sci. 125, 13

R14	Sicilia-Aguilar A., et al. 2004, Astron. J. 128, 805

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