Studies of a short and long - term stability of an active hydrogen maser with stand alone cavity auto tuning
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1993 ◽
Vol 98
(B3)
◽
pp. 4619-4626
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1962 ◽
Vol I-11
(3 and 4)
◽
pp. 248-250
2009 ◽
Vol 71
(2)
◽
pp. 181-189
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