@book{32887,
	author = {Harthill, Norman, ed.},
	title = {Symposium on Russian Airborne Geophysics and Remote Sensing},
	publisher = {SPIE},
	year = {1993},
	series = {Proceedings of SPIE; V. 2111},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/2111}
}