Illig, Jens, Hotho, Andreas, Jäschke, Robert and Stumme, Gerd. "A Comparison of content-based Tag Recommendations in Folksonomy Systems." Paper presented at the meeting of the Postproceedings of the International Conference on Knowledge Processing in Practice (KPP 2007), 2011.

Jäschke, Robert, Marinho, Leandro, Hotho, Andreas, Schmidt-Thieme, Lars and Stumme, Gerd. "Tag Recommendations in Social Bookmarking Systems." AI Communications 21 , no. 4 (2008): 231-247.

Jäschke, Robert, Marinho, Leandro Balby, Hotho, Andreas, Schmidt-Thieme, Lars and Stumme, Gerd. "Tag Recommendations in Folksonomies." Paper presented at the meeting of the Knowledge Discovery in Databases: PKDD 2007, 11th European Conference on Principles and Practice of Knowledge Discovery in Databases, Berlin, Heidelberg, 2007.