@book{26142,
	author = {Dougherty, Edward, ed.},
	title = {Image Algebra and Morphological Image Processing IV},
	publisher = {SPIE},
	year = {1993},
	series = {Proceedings of SPIE; V. 2030},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/2030}
}