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2. A. S. Vasil'kovskaya et al., PMTF, No. 1 (1967).
3. W. Finkelnburg and H. Maecker, Electric Arcs and Thermal Plasma [Russian translation], IL (1961).
4. G. Yu. Dautov, PMTF, No. 4 (1963).
5. H. A. Stine and W. R. Watson, NASA, TND-1331 (1962).