@book{25687,
	author = {Leiner, Dennis, ed.},
	title = {Gradient-Index Optics and Miniature Optics},
	publisher = {SPIE},
	year = {1988},
	series = {Proceedings of SPIE; V. 0935},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/0935}
}