Muhleman, Duane O.; Holdridge, D. B.; Block, N. (May 1962). The astronomical unit determined by radar reflections from Venus. Astronomical Journal. 67 (4): 191—203. Bibcode:1962AJ.....67..191M. doi:10.1086/108693. Using further analysis, this gives a refined figure of 149598845±250.
Muhleman, Duane O.; Holdridge, D. B.; Block, N. (May 1962). The astronomical unit determined by radar reflections from Venus. Astronomical Journal. 67 (4): 191—203. Bibcode:1962AJ.....67..191M. doi:10.1086/108693. Using further analysis, this gives a refined figure of 149598845±250.