1. Retrieve from https://www.dartdrones.com/blog/difference-between-uav-and-uas/
2. Retrieved from https://www.globenewswire.com/en/newsrelease/2021/09/07/2292615/0/en/Unmanned-Aerial-Vehicle-UAV-Market-Size-to-Hit-US-36-Bn-by-2030.html
3. Retrieved from https://www.marketsandmarkets.com/Market-Reports/unmanned-aerial-vehicles-uav-market-662.html
4. Retrieved from https://www.faa.gov/uas/resources/by_the_numbers/
5. Worthington, A.M., Cole, R.S.: V. Impact with a liquid surface, studied by the aid of instantaneous photography. Philos. Trans. R. Soc. Lond. Ser. A Contain. Pap. Math. Phys. Character 189, 137–148 (1897)