HYDROGEN MASER FREQUENCY COMPARISON WITH SWISS CESIUM ATOMIC BEAM STANDARD
1981 ◽
Vol 42
(C8)
◽
pp. C8-395-C8-413
◽
1969 ◽
Vol 223
(1)
◽
pp. 71-102
◽
2005 ◽
Vol 33
(1)
◽
pp. 67-75
◽