Matthew, A. Important Considerations in the development of a test to promote stable bumper engagement in low speed crashes, Motor Insurance, Repair Research Centre, 2004.
 Das, S. The Cost of Automotive Polymer Composites: Assessment of DOE’s, 2001.
 Automotive packaging innovation, Neopolen P. plastics plus, 2006, http://www2.basf.de/basf2/ html/plastics/images/pdfs/engl/schaum/Neopolen_e.pdf (accessed March 13, 2015)
 Schuster, P.J., “Pedestrian bumper design survey”, American Iron and Steel Institute, 2004.
]6[ Zhang, X. H. Zhang, Experimental and numerical investigation on crush resistance of polygonal columns and angle elements, Thin-Walled Stuctures, 2012, Vol. 57: 25-36.
 AlaviNia, A., N. JamalHaddad Hamedani, Comparative analysis of energy absorption and deformations of thin walle, 2010.
 Weigang Chen, Tomasz Wierzbicki, Relative merits of single-cell, multi-cell and foam-filled thin-walled structures in energy absorption-Weigang Chen, Tomasz Wierzbicki, 2001.
 Xiong Zhang, Gengdong Cheng, Hui Zhang, Theoretical prediction and numerical simulation of multi-cell square thin-walled structures.Zhang.X. Cheng. C.Zhang, 2006.
 Xiong Zhang, Hui Zhang, Numerical and theoretical studies on energy absorption of three-panel angle elements-Xiong Zhang, Hui Zhang, 2012.