https://www.mediapost.com/publications/article/13650/why-the-impression-should-remain-the-basic-unit-of.html?edition=
Why The Impression Should Remain The Basic Unit of Measurement - 12/03/2001
unit of measurementimpressionremainbasic
https://www.nist.gov/publications/2014-nist-assessment-phasor-measurement-unit-performance
The first synchrophasor standard was published in 1995. The standard was revised in 2001, 2005, 2011, and 2014 with evolving performance requirements.
phasor measurement unitnistassessmentperformance
https://unitsofmeasurement.github.io/unit-api/site/apidocs/javax/measure/Unit.html
declaration: package: javax.measure, interface: Unit
units of measurementapisnapshot