Col Reference--- ---------
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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