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T. Mrna and  R. Doubrava,  Classification of Impact Damages with Respect of Damage Tolerance Design Approach and Airworthiness Requirements.  [online]. World Academy of Science, Engineering and Technology. September 2017, vol. 11(9). 1111 - 1115[viewed 19 November 2017]. Available from: http://waset.org/abstracts/82178 .