@book{25684,
	author = {Kathman, Alan, ed.},
	title = {Gradient Index, Miniature, and Diffractive Optical Systems},
	publisher = {SPIE},
	year = {1999},
	series = {Proceedings of SPIE; V. 3778},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/3778}
}