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1by Nevel,Donald E.“... for stress is less than 0.2 cycle per second. At this critical frequency the stresses are amplified over...”
Published 1970
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2“... to record and analyze fluctuations within the frequency range 1 to 50 cycles per second. Analysis...”
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3by Gustafsson,Georg“... of the sky was studied and it was found that variations occur at frequencies above thousand cycles per second...”
Published 1964
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