Mamajek, Eric E.; Kenworthy, Matthew A.; Hinz, Philip M.; Meyer, Michael R. (2010). "Discovery of a Faint Companion to Alcor Using MMT/AO 5 μm Imaging". The Astronomical Journal. 139 (3). s. 919. Bibcode:2010AJ....139..919M. doi:10.1088/0004-6256/139/3/919.
Mamajek, Eric E.; Kenworthy, Matthew A.; Hinz, Philip M.; Meyer, Michael R. (2010). "Discovery of a Faint Companion to Alcor Using MMT/AO 5 μm Imaging". The Astronomical Journal. 139 (3). s. 919. Bibcode:2010AJ....139..919M. doi:10.1088/0004-6256/139/3/919.