„Stellar Motions (Extension)”. Australia Telescope Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. 18. 08. 2005. Архивирано из оригинала 06. 06. 2013. г. Приступљено 19. 11. 2008.
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Johnson, Dean R. H.; Soderblom, David R. (1987). „Calculating galactic space velocities and their uncertainties, with an application to the Ursa Major group”. Astronomical Journal. 93 (2): 864—867. Bibcode:1987AJ.....93..864J. doi:10.1086/114370.
„Stellar Motions (Extension)”. Australia Telescope Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. 18. 08. 2005. Архивирано из оригинала 06. 06. 2013. г. Приступљено 19. 11. 2008.