@article{Wilhelm2003,
	title = {User interaction at various levels of data displays},
	author = {Adalbert Wilhelm},
	day = {28},
	journal = {Computational Statistics \& Data Analysis},
	month = {Aug},
	number = {4},
	pages = {471--494},
	url = {http://www.sciencedirect.com/science/article/B6V8V-47785NP-4/1/67033579dd25502ff503a048293dbc9e},
	volume = {43},
	year = {2003},
	biburl = {http://www.bibsonomy.org/bibtex/27c7bc8d36ccbe6de8262eb07439ad43d/smicha},
	keywords = {Direct graphics manipulation }
}