@book{29641,
	author = {Romaniuk, Ryszard, ed.},
	title = {Optical Fibres and Their Applications IV},
	publisher = {SPIE},
	year = {1986},
	series = {Proceedings of SPIE; V. 0670},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/0670}
}