An improved, optically pumped, primary frequency standard: joint development by CRL and NIST
1989 ◽
pp. 116-119
◽
1993 ◽
Vol 42
(2)
◽
pp. 457-461
◽
1994 ◽
Vol 41
(2)
◽
pp. 245-249
◽
1993 ◽
Vol 42
(2)
◽
pp. 453-456
◽