@book{29972,
	author = {van Renesse, Rudolf, ed.},
	title = {Optical Security and Counterfeit Deterrence Techniques},
	publisher = {SPIE},
	year = {1996},
	series = {Proceedings of SPIE; V. 2659},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/2659}
}