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The blue social bookmark and publication sharing system.
- AK Press, (1998)
- Ombre Corte, Verona, (2007)Prefazione di Augusto Illuminati .
- Clup, (1988)
- (2003)
- Seekers, sloths and social reference: Homework questions submitted to a question-answering communityNew Review of Hypermedia and Multimedia (2007)
