1. Aerospace-technology (2002) CargoLifter CL160. Kable Intelligence Limited, London. https://www.aerospace-technology.com/projects/cargolifter/. Accessed 3 June 2020
2. Amaruchkul K, Cooper WL et al (2011) A note on air-cargo capacity contracts. Prod Oper Manage 20 (1). Available via Wiley Online Libary. https://onlinelibrary.wiley.com/doi/full/10.1111/j.1937-5956.2010.01158.x, pp 152–162
3. Amazon (2017) Amazon Prime Air. Seattle/Washington, December 2016 https://www.amazon.de/p/feature/vwjfgns3yyjm9uo. Accessed 24 July 2020
4. Beier L, Einig J, Reich C (2016) Entwicklung und Validierung eines Unterstützungswerkzeuges zur Gestaltung von bodenseitigen Logistik- und Betriebsprozessen an Fracht-UAV. Project work DLR/BKTM, March 2016
5. Benney R, Barber J, et al (2005) The new military applications of precisi on Air drop systems. US Army Research, Development and Engineering Command, Natick, 26–29 Sep 2005