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2. Maurer, W.C.: Novel drilling techniques, 1st edn(Pergamon 1968)
3. Johnson, W.: Impact strength of materials, 1st edn(Edward Arnold, London 1972)
4. Hill, R.: Mathematical theory of plasticity, 1st edn(Oxford University Press 1950)
5. Maurer, W.C.: Mathematical theory of plasticity, 1st edn(Oxford University Press 1950)