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(en) Johnson, Dean R. H.; Soderblom, David R., « Calculating galactic space velocities and their uncertainties, with an application to the Ursa Major group », Astronomical Journal, vol. 93, no 2, , p. 864–867 (DOI10.1086/114370, Bibcode1987AJ.....93..864J).
Hugh M. Johnson, « The Kinematics and Evolution of Population I Stars », Publications of the Astronomical Society of the Pacific, vol. 69, no 406, , p. 54 (DOI10.1086/127012, Bibcode1957PASP...69...54J).
(en) Johnson, Dean R. H.; Soderblom, David R., « Calculating galactic space velocities and their uncertainties, with an application to the Ursa Major group », Astronomical Journal, vol. 93, no 2, , p. 864–867 (DOI10.1086/114370, Bibcode1987AJ.....93..864J).
Hugh M. Johnson, « The Kinematics and Evolution of Population I Stars », Publications of the Astronomical Society of the Pacific, vol. 69, no 406, , p. 54 (DOI10.1086/127012, Bibcode1957PASP...69...54J).