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2020 UA
Minor Planet Center. International Astronomical Union. 19 January 2021閲覧。 ^ Bruton, Dan. “Conversion of Absolute Magnitude to Diameter for Minor Planets”.
2020 SL1
Planet Center. International Astronomical Union. 19 January 2021閲覧。 ^ a b Bruton, Dan. “Conversion of Absolute Magnitude to Diameter for Minor Planets”.
2020 SW
http://www.minorplanet.info/MPB/issues/MPB_48-1.pdf 23 January 2021閲覧。. ^ a b Bruton, Dan. “Conversion of Absolute Magnitude to Diameter for Minor Planets”.
2021 AV7
Planet Center. International Astronomical Union. 19 January 2021閲覧。 ^ a b Bruton, Dan. “Conversion of Absolute Magnitude to Diameter for Minor Planets”.
Wayback Machine., History of Science and Technology in Islam ^ a b c d e Bruton, Eric (1979). The History of Clocks and Watches. New York: Crescent Books