1. Aastrup, J., Halldórsson, Á., ‘Epistemological role of case studies in logistics: a critical realist perspective’, International Journal of Physical Distribution and Logistics Management, vol. 38, no. 10, 2008, pp. 746–763.
2. Additive Center, ‘Royal Dutch Army: Increasing adaptability on the battlefield with 3D printing’, Additive Center, January 2020, https://additivecenter.com/2020/01/23/royal-dutch-army-increasing-adaptability-on-the-battlefield-with-3d-printing/, (accessed 15 June 2021).
3. Additive Manufacturing, ‘3D Printing and Coronavirus: U.S. Additive Manufacturers Share
4. Their Experiences’, Additive Manufacturing G. B. Media, May 2020, https://www.additivemanufacturing.media/blog/post/3d-printing-and-coronavirus-us-additivemanufacturers-share-their-experiences, (accessed 15 June 2021).
5. Akmal, J.S., ‘Unique Component Manufacturing Through Direct and Indirect Additive Manufacturing’, Aalto University, September 2017, http://urn.fi/URN:NBN:fi:aalto-201710307355, (accessed 28 June 2021).