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   4. Gamon, M. A., Wittlin, G. and LaBarge, W. L., "KRASH85 User's Guide -Input/Output Format," Lockheed-California Company, DOT/FAA/CT-85/10, May 1985.
   5. Wittlin, G.,"Program KRASH: Evolution of an Analytical Tool to Evaluate Aircraft Structural Crash Dynamics Response," Proceedings of the American Helicopter Society Specialists' Meeting on Crashworthy Design of Rotorcraft, Atlanta, Georgia, April 1986.
   6.  Cronkhite, J. D., "Design of Airframe Structures for Crash Impact," Proceedings of the American Helicopter Society Specialists' Meeting on Crashworthy Design of Rotorcraft, Atlanta, Georgia, April 1986.
   7. Dassault systems, ABAQUS analysis user’s manual 6.12, volume I-V.
   8. Internet sources.
   9. Liu Xiaochuan, Guo Jun, Bai Chunyu, Sun Xiasheng, Mou Rangke, 2015, “Drop test and crash simulation of a civil airplane fuselage section”, Chinese Journal of Aeronautics, 28(2) 447-456.