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Helmut Hellwig
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Hydrogen spin exchange frequency shifts
Helmut Hellwig · U.S. National Bureau of Standards; for sale by the Supt. of Docs., U.S. Govt. Print. Off., Washington
13 sayfa · 1970
Frequency stability / Spin exchange / Hydrogen / Masers / Storage tubes
A review of precision oscillators
Helmut Hellwig · U.S. Dept. of Commerce, National Bureau of Standards
19 sayfa · 1975
Crystal Oscillators / Frequency standards
Frequency standards and clocks
Helmut Hellwig · Dept. of Commerce, National Bureau of Standards, Institute for Basic Standards, Time and Frequency Division
64 sayfa · 1977
Frequency standards / Systems and standards / Time / Time-signals
The ion storage technique for application in frequency standards
Helmut Hellwig · U.S. National Bureau of Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off.
24 sayfa · 1970
Frequency standards / Ions