@book{24109,
	author = {Watkins, Wendell, ed.},
	title = {Characterization and Propagation of Sources and Backgrounds},
	publisher = {SPIE},
	year = {1994},
	series = {Proceedings of SPIE; V. 2223},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/2223}
}