1. Musk E. Hyperloop Alpha, SpaceX; 2013. https://www.spacex.com/sites/spacex/files/hyperloop_alpha.pdf.
2. Great Lakes Hyperloop: Feasibility Study, Tech. rep., Transportation Economics and Management Systems Inc, prepared for Northeast Ohio Areawide Coordinating Agency in Cooperation with Hyperloop Transportation Technologies, Inc.; 12 2019.
3. The biggest challenges that stand in the way of Hyperloop, Interesting Engineering; 2017. https://interestingengineering.com/biggest-challenges-stand-in-the-way-of-hyperloop.
4. Un total de 15 organizaciones se inscriben en un grupo de trabajo que busca la estandarización del sistema Hyperloop, 2019/07/02 - Europa Press/ Andalucía; 2019.
5. UNE promotes the future development of European standards for hyperloop systems, 2020/02/14 - UNE; 2020. https://tinyurl.com/sg2zru5.