References for the numbering systems

Col	Reference

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

R1	Claria J.J., et al. 2003, Astron. Astrophys. 409, 541

R2	Lynga G. 1959, Ark. Astr. 2,379

R3	Jorgensen U.G., Westerlund B.E. 1988, Astr. Ap. Suppl. 72, 193

R4	Denoyelle J. 1987, Astron. Astrophys. Suppl. 70, 373

R5	Andersen T.B., Reiz A. 1983, Astron. Astrophys. Suppl. 53, 181

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

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