@book{33511,
	author = {Shoemaker, Charles M., ed.},
	title = {Unmanned Systems Technology XXI},
	publisher = {SPIE},
	year = {2019},
	series = {Proceedings of SPIE; V. 11021},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11021}
}