Griffin, R. F.; McClure, R. D. (February 2009). "Spectroscopic binary orbits for the Henry Draper Catalogue stars". The Observatory. 129: 28–32. Bibcode:2009Obs...129...28G. ISSN0029-7704.
Griffin, R. F.; McClure, R. D. (February 2009). "Spectroscopic binary orbits for the Henry Draper Catalogue stars". The Observatory. 129: 28–32. Bibcode:2009Obs...129...28G. ISSN0029-7704.