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2. Cumulative Damage of Reinforced Concrete Subjected to Repeated Impact;Knab;Cement and Concrete Research,1982
3. Standard Test Method for Penetration Resistance of Hardened Concrete, ASTM Designation C 803-79, American Society for Testing and Materials, Philadelphia, PA.
4. Fundamentals of Protective Design,1946
5. Impact Strength of Concrete;Green,1964