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Additional information
Izvestiya VUZ. Radiofizika, Vol. 11, No. 8, pp. 1173–1179, 1968
Central Scientific-Research Institute of Automatic Control Devices
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Zyabkina, E.I., Meshcheryakov, Y.I. & Rozenbaum, Y.I. Signal and noise conversion in four-level quantum systems. Radiophys Quantum Electron 11, 670–673 (1968). https://doi.org/10.1007/BF01033711
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DOI: https://doi.org/10.1007/BF01033711