F. Djamaluddin, S. Abdullah, A.K. Arrifin, and Z.M. Nopiah. “MODELING AND OPTIMIZATION OF ALUMINUM FOAM CYLINDRICAL DOUBLE TUBES UNDER AXIAL IMPACT”. Journal of Mechanical Engineering and Sciences, vol. 8, June 2015, pp. 1383-92, doi:10.15282/jmes.8.2015.13.0135.