References for the numbering systems

Col	Reference

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

R1	Turner D.G., et al. 1980, Astron. J. 85,1193

R2	Herbst W., Miller D.P. 1982, Astron. J. 87, 1478

R3	Balona L.A. 1994, Mon. Not. R. Astr. Soc. 267, 1060

R4	Baume G., et al. 2003, Astron. Astrophys. 402, 549

R5	Evans C.J., et al. 2005, Astron. Astrophys. 437, 467

R6	McSwain M.V., Gies D.R., 2005, ApJS 161, 118

R7	Delgado A.J. et al. 2007, Astron. Astrophys. 467, 1397 

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