!!!! Metric system reform of 2019

https://en.wikipedia.org/wiki/Conversion_of_units
https://en.wikipedia.org/wiki/Coulomb
https://en.wikipedia.org/wiki/Planck_constant
https://en.wikipedia.org/wiki/Molar_mass
https://en.wikipedia.org/wiki/Angstrom

==== Talks

==== BIPM

https://www.bipm.org/utils/common/pdf/si_brochure_8.pdf @@ BIPM: Le Système  international d’unités, 8th Brochure (2006)
https://www.bipm.org/utils/en/pdf/CIPM/CIPM2017-EN.pdf @@ BIPM: Proceedings of 106th CIPM meeting (2017)
https://www.bipm.org/utils/common/pdf/CGPM-2018/26th-CGPM-Resolutions.pdf @@ BIPM: Resolutions of the 26th CGPM conference (2018) (summary)
https://www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9-EN.pdf @@ BIPM: International System of Units, 9th Brochure (2018)

==== Other
https://iupac.org/new-definition-mole-arrived/ @@ IUPAC: A new definition of the mole has arrived (2018)
https://www.degruyter.com/view/j/pac.1996.68.issue-4/pac199668040957/pac199668040957.xml @@ Book: H. P. Lehmann et al, Glossary of ... units in Clinical Chemistry (IUPAC-IFCC Recs 1996)
https://www.degruyter.com/view/j/pac.1992.64.issue-10/pac199264101535/pac199264101535.xml @@ Book: P. de Bievre et al, 'Atomic weight': The name, its history, definition, and units
http://goldbook.iupac.org/terms/view/A00543 @@ IUPAC Gold book: Avogadro constant (as of 2006)