https://www.nist.gov/publications/nist-chip-realizing-si-units-microfabricated-alkali-vapour-cells
NIST on a Chip: Realizing SI units with microfabricated alkali vapour cells | NIST
We describe several ways in which microfabricated alkali atom vapour cells might potentially be used to accurately realize a variety of SI units, including the
on asi unitsnistchipalkali
https://xdevs.com/article/si2019/
xDevs.com | Updated 2019 SI units transfers and tour of ITRI CMS NMI Labs @xDevs
SI 2019 Update and practical example for unit of Volt and Ohm transfers
si unitsupdatedtransferstourcms
https://ukma.org.uk/what-is-metric/definitions/non-si-units/
Non-SI units – UK Metric Association
There are many thousands of measurement units outside the International System of Units (SI). A number of these non-SI units have been given the special status...
si unitsnonukmetricassociation