@book{29099,
	author = {Winston, Roland, ed.},
	title = {Nonimaging Optics: Maximum Efficiency Light Transfer},
	publisher = {SPIE},
	year = {1991},
	series = {Proceedings of SPIE; V. 1528},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/1528}
}