@book{22890,
	author = {Gilbreath, G. Charmaine, ed.},
	title = {Active and Passive Signatures IV},
	publisher = {SPIE},
	year = {2013},
	series = {Proceedings of SPIE; V. 8734},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/8734}
}