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2. A. C. Damask: Studies in Radiation Effects on Solids, Vol. 2, Gordon and Breach, New York, (1967), p. 1.
3. 2) J. M. Denney: Phys. Rev., 94 (1954), 1417.
4. 3) A. Boltax: Radiation Effects on Materials, Vol. 1 (ASTM STP-208), ASTM, Philadelphia, (1957), p. 183;
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