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3. S. Timoshenko, Vibration Problems In Engineering, second ed., D. Van Nostrand Company Inc., New York, USA, 1937.
4. A.E.H. Love, M.A., D. Sc., F.R. S., A Treatise on The Mathematical Theory of Elasticity, fourth ed., New York Dover Publications, 1944.
5. W. Johnson, Impact Strength of Materials, 1st., Edward Arnold, 1972.