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4. Werkstoffprufung: Handbuch, Blumenauer H., Ed., Leipzig: VEB Deutscher Verlag fur Grundstoffindustrie, 1977.
5. Ermolov, I.N. and Ostanin, Yu.Ya., Metody i sredstva nerazrushayushchego kontrolya kachestva (Methods and Tools for Nondestructive Quality Testing), Moscow: Vysshaya shkola, 1988.