@book{29104,
	author = {Winston, Roland, ed.},
	title = {Nonimaging Optics: Maximum Efficiency Light Transfer VII},
	publisher = {SPIE},
	year = {2004},
	series = {Proceedings of SPIE; V. 5185},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/5185}
}