@book{29165,
	author = {Singer, Kenneth, ed.},
	title = {Nonlinear Optical Properties of Organic Materials IV},
	publisher = {SPIE},
	year = {1991},
	series = {Proceedings of SPIE; V. 1560},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/1560}
}