@book{30681,
	author = {Wilkerson, Gary, ed.},
	title = {Passive Materials for Optical Elements},
	publisher = {SPIE},
	year = {1991},
	series = {Proceedings of SPIE; V. 1535},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/1535}
}