@book{25519,
	author = {Begley, David, ed.},
	title = {Free-Space Laser Communication Technologies II},
	publisher = {SPIE},
	year = {1990},
	series = {Proceedings of SPIE; V. 1218},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/1218}
}