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- Yu.P. Vakhrushin, Yu.F. Chichikalov, A.V. Stepanov, M.F. Vorogushin
D.V. Efremov Scientific Research Institute of Electrophysical Apparatus, Leningrad, USSR
- I.A. Ermakov, L.A. Il'in
Central Scientific Research Roentgen Radiological Institute, Leningrad, USSR
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