See references page for a full list of articles.
This research has made use of the SIMBAD database,
operated at CDS, Strasbourg, France.
2000,A&AS,143,9 , "The SIMBAD astronomical database", Wenger et al.
This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. The original description of the VizieR service was published in A&AS 143, 23
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