Do you have dozens of PDF files from your favorite scientific articles scattered on your harddrive? Do you also try to desperately organize them by renaming and archiving them in folders? But like the piles of printed articles on your desk, you can't keep up with all the new papers you download, and despite all your efforts it has become impossible to find that one article.
X. Liu, K. Maly, M. Zubair, und M. Nelson. Proceedings of the 3rd ACM/IEEE-CS joint conference on Digital libraries, Seite 191--198. Washington, DC, USA, IEEE Computer Society, (2003)
P. Heymann, und H. Garcia-Molina. Second ACM International Conference on Web Search and Data Mining (WSDM 2009), Late Breaking Results Session, Seite 1--4. Stanford InfoLab, (Februar 2009)