2008

Jäschke, R.; Marinho, L.; Hotho, A.; Schmidt-Thieme, L. & Stumme, G. (2008), 'Tag Recommendations in Social Bookmarking Systems', AI Communications 21 , 231-247 .

2005

Golder, S. & Huberman, B. A. (2005), 'The Structure of Collaborative Tagging Systems' .