References for the numbering systems

Col	Reference

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R1 Lindoff U., Johansson K., 1968, Ark. Astr. 5,45

R2 Ramsay G., Pollaco D.L., 1992, Astron. Astrophys. Suppl.

R3 Paunzen E., Maitzen H.M., 2001, Astron. Astrophys. 373, 153

R4 McSwain M.V., Gies D.R., 2005, ApJS 161, 118

R5 Piatti, A.E., et al., 2007, Mon. Not. R. Astron. Soc. 377, 1737


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