Social Bookmarking Tools (I): A General Review.
D-Lib Magazine, 11(4), 2005.
Tony Hammond, Timo Hannay, Ben Lund und Joanna Scott.
[doi]  [Kurzfassung]  [BibTeX] 
Social Bookmarking Tools (II): A Case Study - Connotea.
D-Lib Magazine, 11(4), 2005.
Ben Lund, Tony Hammond, Martin Flack und Timo Hannay.
[doi]  [BibTeX]