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Roberts, Lewis C., Jr.; et al. (2015-04), “Know the Star, Know the Planet. III. Discovery of Late-Type Companions to Two Exoplanet Host Stars”, Astronomical Journal149 (4): 118, Bibcode: 2015AJ....149..118R, doi:10.1088/0004-6256/149/4/118
Riddle, Reed L.; et al. (2015-01), “A Survey of the High Order Multiplicity of Nearby Solar-type Binary Stars with Robo-AO”, Astrophysical Journal799 (1): 4, Bibcode: 2015ApJ...799....4R, doi:10.1088/0004-637X/799/1/4
Moutou, C.; et al. (2005-08). “The HARPS search for southern extra-solar planets IV. Three close-in planets around HD 2638, HD 27894 and HD 63454”. Astronomy and Astrophysics439 (1): 367-373. Bibcode: 2005A&A...439..367M. doi:10.1051/0004-6361:20052826.