References for the numbering systems

Col	Reference

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R1 Seggewiss W. 1967, Thesis (Univ. Munster)

R2 Paunzen E., et al. 2005, Astron. Astrophys. 443, 157

R3 McSwain M.V., Gies D.R., 2005, ApJS 161, 118

R4 Carraro G., Seleznev A.F., 2012, Mon. Not. R. Astron. Soc. 419, 3608


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