@book{26007,
	author = {Fagan, William, ed.},
	title = {Holographic Optical Security Systems},
	publisher = {SPIE},
	year = {1991},
	series = {Proceedings of SPIE; V. 1509},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/1509}
}