1. T. Wohlers, Wohlers Report 2102. Additive Manufacturing and 3D Printing State of the Industry Annual Worldwide Progress Report. (2012) Wohlers Associates Inc. ISBN 0-9754429-8-8.
2. M. Tuck, C. Hague, I. Ashcroft, R. Wildman, A comparative Study of Metallic Additive Manufacturing Power Consumption, Proc. Solid Freeform Fabrication Symposium, (2010) Austin, USA, 8-10 Aug. 2010, 278-88.
3. T. Campbell, C. Williams, O. Ivanova, B. Garrett, Strategic Foresight Report. Could 3D Printing Change the World? (2011).
4. Top 10 emerging technology trends, World Economic Forum, Global Agenda Council on Emerging Technologies. Online: http: /www. weforum. org/content/global-agenda-council-emerging-technologies-2012-2013 [Accessed October 2013].
5. A. Koptyug, L. -E. Rännar, M. Bäckström, R. P. Klingvall, Electron Beam Melting: Moving from Macro- to Micro- and Nanoscale, Materials Science Forum, 706-709 (2012) 532-7.