Col Reference--- ---------
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R4 Kerridge S.J., et al. 1973, Astron.J. 78, 53
R5 Bergdorfer Spektral Durchmusterung S.A. no 24
R6 Purgathofer A. 1964, Ann. Univ. Sternw. Wien 26 no 2
R7 Fang C. 1970, Astron. Astrophys. 4, 75
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