@book{31083,
	author = {Yu, Francis, ed.},
	title = {Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV},
	publisher = {SPIE},
	year = {1998},
	series = {Proceedings of SPIE; V. 3470},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/3470}
}