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APPLETON EV, 1922, PHILOS MAG, V43, P183
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APPLETON EV, 1923, PHILOS MAG, V45, P410
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BIEBERBACH BL, 1926, THEORIE DIFFERENTIAL, P39
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Frequency division
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HEEGNER K, 1924, Z PHYS, V29, P910
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A new frequency transformer or frequency changer
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[10]
OLLENDORF F, 1926, ARCH ELEKTROTECH, V16, P280