@book{33912,
	author = {Betensky, Ellis, ed.},
	title = {Zoom Lenses II},
	publisher = {SPIE},
	year = {1997},
	series = {Proceedings of SPIE; V. 3129},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/3129}
}