(en) R. O. Gray, M. G. Napier et L. I. Winkler, « The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars », The Astronomical Journal, vol. 121, no 4, , p. 2148–2158 (DOI10.1086/319956, Bibcode2001AJ....121.2148G)
(en) R. O. Gray, M. G. Napier et L. I. Winkler, « The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars », The Astronomical Journal, vol. 121, no 4, , p. 2148–2158 (DOI10.1086/319956, Bibcode2001AJ....121.2148G)
(en) Henry Zirm, « The Rapid Convergence of 44 Boötis with Revised Orbit and Updated Ephemerides », Journal of Double Star Observations, vol. 7, no 1, , p. 24–36 (Bibcode2011JDSO....7...24Z, lire en ligne)
(en) Henry Zirm, « The Rapid Convergence of 44 Boötis with Revised Orbit and Updated Ephemerides », Journal of Double Star Observations, vol. 7, no 1, , p. 24–36 (Bibcode2011JDSO....7...24Z, lire en ligne)