@article {bullock2004real,
	title = {Real-time tracking for visual interface applications in cluttered and occluding situations},
	journal = {Image and Vision Computing},
	volume = {22},
	number = {12},
	year = {2004},
	pages = {1083{\textendash}1091},
	publisher = {Elsevier},
	author = {Bullock, David J and Zelek, John S}
}
