@book{32939,
	author = {Watkins, Wendell, ed.},
	title = {Targets and Backgrounds: Characterization and Representation IV},
	publisher = {SPIE},
	year = {1998},
	series = {Proceedings of SPIE; V. 3375},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/3375}
}