Article (tagrecomfolk)
Jäschke, R.; Marinho, L.; Hotho, A.; Schmidt-Thieme, L. & Stumme, G.
Tag Recommendations in Folksonomies
2007

Techreport (citeulike:739394)
Heymann, P. & Garcia-Molina, H.
Collaborative Creation of Communal Hierarchical Taxonomies in Social Tagging Systems
Standford University, Computer Science Department, 2006

Article (golder2005)
Golder, S. & Huberman, B. A.
The Structure of Collaborative Tagging Systems
2005