@article{CaLP07,
	title = {Collaborative Tagging and Semiotic Dynamics},
	author = {Ciro Cattuto and Vittorio Loreto and Luciano Pietronero},
	journal = {PNAS},
	pages = {1461--1464},
	url = {doi:10.1073/pnas.0610487104},
	volume = {104},
	year = {2007},
	biburl = {http://www.bibsonomy.org/bibtex/2c958b2f97a0557abdb3778faa34802bb/michael},
	file = {CaLP07.pdf:folksonomies\\CaLP07.pdf:PDF},
	keywords = {DISS collaboration folksonomies longtail powerlaw semiotics socialbookmarking tagging tagging_powerlaw tagging_semantics tagging_usage teaggingeffects toread }
}