@techreport{HeGa06,
	title = {Collaborative Creation of Communal Hierarchical Taxonomies in Social
	Tagging Systems},
	author = {Paul Heymann and Hector Garcia-Molina},
	institution = {Computer Science Department},
	month = {April},
	school = {Standford University},
	url = {http://dbpubs.stanford.edu:8090/pub/2006-10},
	year = {2006},
	biburl = {http://www.bibsonomy.org/bibtex/2a6010ad0fef7cb1442298402ebb979b6/michael},
	abstract = {Collaborative tagging systems---systems where many casual users annotate
	objects with free-form strings (tags) of their choosing---have recently
	emerged as a powerful way to label and organize large collections
	of data. During our recent investigation into these types of systems,
	we discovered a simple but remarkably effective algorithm for converting
	a large corpus of tags annotating objects in a tagging system into
	a navigable hierarchical taxonomy of tags. We first discuss the algorithm
	and then present a preliminary model to explain why it is so effective
	in these types of systems.},
	file = {HeGa06.pdf:folksonomies\\HeGa06.pdf:PDF}, timestamp = {2007.10.11},
	keywords = {DISS collaborative creation folksonomy hierarchical systems tagging tagging_characteristics tagging_clustering tagging_convergence tagging_network tagging_structure taxonomy toread }
}