@book{29035,
	author = {Nowak, Jerzy, ed.},
	title = {Nonconventional Optical Imaging Elements},
	publisher = {SPIE},
	year = {1994},
	series = {Proceedings of SPIE; V. 2169},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/2169}
}