@book{25695,
	author = {Nasr, Hatem, ed.},
	title = {Ground Sensing},
	publisher = {SPIE},
	year = {1993},
	series = {Proceedings of SPIE; V. 1941},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/1941}
}