(en) R. T. Zavala, S. J. Adelman, C. A. Hummel, A. F. Gulliver, H. Caliskan, J. T. Armstrong, D. J. Hutter, K. J. Johnston et T. A. Pauls, « The Mercury-Manganese Binary Star φ Herculis: Detection and Properties of the Secondary and Revision of the Elemental Abundances of the Primary », The Astrophysical Journal, vol. 655, no 2, , p. 1046-1057 (lire en ligne)DOI10.1086/510108
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(en) R. T. Zavala, S. J. Adelman, C. A. Hummel, A. F. Gulliver, H. Caliskan, J. T. Armstrong, D. J. Hutter, K. J. Johnston et T. A. Pauls, « The Mercury-Manganese Binary Star φ Herculis: Detection and Properties of the Secondary and Revision of the Elemental Abundances of the Primary », The Astrophysical Journal, vol. 655, no 2, , p. 1046-1057 (lire en ligne)DOI10.1086/510108