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avogadro constant The NIST Reference on Constants, Units, and Uncertainty. US National Institute of Standards and Technology. 2019-05-20. 2018 CODATA recommended values
molar mass constant The NIST Reference on Constants, Units, and Uncertainty. US National Institute of Standards and Technology. 2019-05-20. 2018 CODATA recommended values
molar mass of carbon-12 The NIST Reference on Constants, Units, and Uncertainty. US National Institute of Standards and Technology. 2019-05-20. 2018 CODATA recommended values
Loschmidt, J. (1865). “Zur Grösse der Luftmoleküle”. Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften Wien52 (2): 395–413.English translation.