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WikiPedia: Bibcode http://adsabs.harvard.edu/abs/1924MNRAS..84..308E http://adsabs.harvard.edu/abs/1970ApJ...161L..77K http://adsabs.harvard.edu/abs/1974AJ.....79..819H http://adsabs.harvard.edu/abs_doc/help_pages/data.... http://cdsweb.u-strasbg.fr/simbad/refcode/refcode-...