N. C. Mehta, Viral V. Shiyani & Jemish R. Nasit, “Metal forming analysis,” International Journal of Emerging Technology and Advanced Engineering, vol. 3, Issue 5, May 2013.
 M.J. Jweeg, M. H. Tlafeh, A.D. Assi, “The design and Manufacturing of a hydrostatic extrusion apparatus for Compound Cylinders from Al and Mg,” Diyala Journal of Engineering Sciences, vol. 6, no. 2, pp 86-103, 2013.
 G.W. Rowe, “Principles of industrial metalworking processes,” Edwar Arnold, 1977.
 M.J. Jweeg, M. H. Tlafeh, A.D. Assi, “Evaluation of a new hypothetical concept (LHSIR) for die profile design for hydrostatic extrusion of Al/Mg compound,” Diyala Journal of Engineering Sciences, vol. 7, No. 1, pp 40-61, 2014.
 L. D. Dugandzic, “Hot impression die forging process parameter development for production of 6061 aluminum alloy medallions,” Report, California Polytechnic State University, 2004.
 R.R. Raja, S.L. Lakshminarasimhan and P.M. Murugesan, “Investigation of barreling radius and top surface area for cold upsetting of aluminum specimens,” International Journal of Modern Engineering Research (IJMER), vol. 3, Issue. 6, pp. 3852-3862, 2013.
 K.B. Baskaran and R.N. Narayanasamy, “An experimental investigation on work harding behavior of elliptical shaped billets of aluminum during cold upsetting,” Materials and Design, vol. 29, issue 6, pp. 1240–1265, 2008.
 T.A. Altinbalik, “An experimental study of barreling and fem based simulation in cold upsetting of aluminum,” International Journal of Modern Manufacturing Technologies, ISSN 2067–3604, vol. III, no. 1, 2011.
 K. B. Baskaran and R.N. Narayanasamy, “Some aspects of barreling in elliptical shaped billets of aluminum during cold upset forging with lubricant,” Materials and Design, pp. 638–661, 2008.
 T.A. Altinbalik & Y.C. Can, “An upper bound analysis and determination of the barreling profile in upsetting,” Indian Journal of Engineering & material Sciences, IJEMS, vol. 18, no. 6, pp. 416-424, 2011