@book{27654,
	author = {Penn, William, ed.},
	title = {Liquid Crystals and Spatial Light Modulator Materials},
	publisher = {SPIE},
	year = {1986},
	series = {Proceedings of SPIE; V. 0684},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/0684}
}