1. M. Stock, R. Davis, E. Mirandés and M. Milton, Metroligia 56, 022001 (2017).
2. Mise en pratique for the definition of the kilogram in the SI, SI Brochure-9th edition (2019) - Appendix 2, https://www.bipm.org/utils/en/pdf/si-mep/SI-App2-kilogram.pdf
3. 臼田孝, 新しい1キログラムの測り方;科学が進めば単位が変わる, 講談社 (2018).
4. G. Girard, Metrologia 31, 317 (1994).
5. 2011 Resolution 1: on the possible revision of the International System of Units, the SI CR CGPM vol.24532(2011), http://bipm.org/en/CGPM/db/24/1