Optical frequency measurements at the 20th decimal digit
1983 ◽
Vol 32
(1)
◽
pp. 150-154
◽
Keyword(s):
2000 ◽
Vol 47
(2)
◽
pp. 513-517
◽
2003 ◽
Vol 52
(2)
◽
pp. 240-244
◽