Jäschke, Robert and Eisterlehner, Folke and Hotho, Andreas and Stumme, Gerd. Testing and Evaluating Tag Recommenders in a Live System. RecSys '09: Proceedings of the 2009 ACM Conference on Recommender Systems. ACM, New York, NY, USA, Year 2009.

Ames, Morgan and Naaman, Mor. Why we tag: motivations for annotation in mobile and online media. Proceedings of the SIGCHI conference on Human factors in computing systems. CHI '07, 971--980, ACM, New York, NY, USA, Year 2007.