Robuta

https://www.nist.gov/publications/measurement-dynamic-end-end-cavity-phase-shifts-cesium-fountain-frequency-standards
phase shiftsmeasurementdynamicendcavity
https://www.nist.gov/publications/terminal-report-microwave-measurement-standards-section-very-high-frequency-field
terminalreportmicrowavemeasurementstandards
https://www.nist.gov/publications/high-accuracy-hg-microwave-and-optical-frequency-standards-cryogenic-linear-ion-traps
frequency standardshighaccuracyhgmicrowave