TY  - JOUR
AU  - Neil Ashby
AU  - Thomas Heavner
AU  - Steven Jefferts
AU  - Thomas Parker
AU  - A Radnaev
AU  - Y Dudin
C2  - Physical Review Letters
DA  - 2007-02-16
LA  - en
M1  - 98
PB  - Physical Review Letters
PY  - 2007
TI  - Testing local position invariance with four Cesium fountain primary frequency standards and four NIST Hydrogen masers
UR  - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50482
ER  -