1. Srisairam V, Kumar M (2015) Rapid prototyping–additive/solid free form manufacturing in automobile engineering 3(4):799–802
2. Manghnani R (2015) An exploratory study: the impact of additive manufacturing on the automobile industry. Int J Curr Eng Technol 5(5):3407–3410
3. Cooper D, Thornby J, Blundell N, Henrys R, Williams MA, Gibbons G (2015) Design and manufacture of high performance hollow engine valves by additive layer manufacturing. Mater & Des 69: 44–55
4. Cotteleer M, Neier M, Crane J (2014) 3D opportunity in tooling: additive manufacturing shapes the future. Deloitte University Press
5. https://blog.trimech.com/a-brief-history-of-additive-manufacturing