@inproceedings {zelek1988fex,
	title = {Fex: a knowledge-based system for planimetric feature extraction},
	booktitle = {Recent Advances in Sensors, Radiometry, and Data Processing for Remote Sensing},
	volume = {924},
	year = {1988},
	pages = {292{\textendash}296},
	publisher = {International Society for Optics and Photonics},
	organization = {International Society for Optics and Photonics},
	author = {Zelek, John S}
}
