@book{25688,
	author = {Pluta, Maksymilian, ed.},
	title = {Gradient-Index Optics in Science and Engineering},
	publisher = {SPIE},
	year = {1996},
	series = {Proceedings of SPIE; V. 2943},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/2943}
}