Angeletou, S., Sabou, M. & Motta, E. (2008). Semantically enriching folksonomies with FLOR. In Proc of the 5th ESWC. workshop: Collective Intelligence &amp; the Semantic Web,.

Krause, B., Jäschke, R., Hotho, A. & Stumme, G. (2008). Logsonomy - social information retrieval with logdata. HT '08: Proceedings of the nineteenth ACM conference on Hypertext and hypermedia (p./pp. 157--166),Pittsburgh, PA, USA: ACM.ISBN: 978-1-59593-985-2 
, T., Yoshikawa, M., Uchiyama, T. & Uchiyama, T. (2009). The Effectiveness of Latent Semantic Analysis for Building Up a Bottom-up Taxonomy from Folksonomy Tags.. World Wide Web, 12, 421-440. 

Marinho, L. B., Nanopoulos, A., Schmidt-Thieme, L., Jäschke, R., Hotho, A., Stumme, G. & Symeonidis, P. (2011). Social Tagging Recommender Systems.. In F. Ricci, L. Rokach, B. Shapira & P. B. Kantor (ed.),Recommender Systems Handbook (pp. 615-644). Springer. ISBN: 978-0-387-85819-7.

Cattuto, C., Benz, D., Hotho, A. & Stumme, G. (2008). Semantic Grounding of Tag Relatedness in Social Bookmarking Systems. The Semantic Web - ISWC 2008 (p./pp. 615--631),: Springer Berlin / Heidelberg.ISBN: 978-3-540-88563-4 

Kim, H. L., Scerri, S., Breslin, J. G., Decker, S. & Kim, H. G. (2008). The State of the Art in Tag Ontologies: A Semantic Model for Tagging and Folksonomies. Proceedings of the 2008 International Conference on Dublin Core and Metadata Applications (p./pp. 128--137),: Dublin Core Metadata Initiative.

Rezel, R. & Liang, S. (2010). SWE-FE: Extending folksonomies to the Sensor Web. 2010 International Symposium on Collaborative Technologies and Systems (CTS) (p./pp. 349--356), May, : IEEE.
, T. (2009). Recommender Systems for Social Bookmarking. Unpublished doctoral disseration, Tilburg University.

Illig, J., Hotho, A., Jäschke, R. & Stumme, G. (2011). A Comparison of Content-Based Tag Recommendations in Folksonomy Systems. In K. E. Wolff, D. E. Palchunov, N. G. Zagoruiko & U. Andelfinger (eds.), Knowledge Processing and Data Analysis (p./pp. 136--149),: Springer.ISBN: 978-3-642-22139-2 

Jäschke, R., Hotho, A., Mitzlaff, F. & Stumme, G. (2012). Challenges in Tag Recommendations for Collaborative Tagging Systems. In J. J. Pazos Arias, A. Fernández Vilas & R. P. Díaz Redondo (ed.),Recommender Systems for the Social Web, Vol. 32 (pp. 65--87). Springer. ISBN: 978-3-642-25694-3.

Balby Marinho, L., Hotho, A., Jäschke, R., Nanopoulos, A., Rendle, S., Schmidt-Thieme, L., Stumme, G.,, Symeonidis, P. (2012).Recommender Systems for Social Tagging Systems. Springer.ISBN: 978-1-4614-1893-1 

Wetzker, R., Zimmermann, C., Bauckhage, C. & Albayrak, S. (2010). I tag, you tag: translating tags for advanced user models. Proceedings of the third ACM international conference on Web search and data mining (p./pp. 71--80),New York, New York, USA: ACM.ISBN: 978-1-60558-889-6 

Landia, N., Anand, S. S., Hotho, A., Jдschke, R., Doerfel, S. & Mitzlaff, F. (2012). Extending FolkRank with content data. Proceedings of the 4th ACM RecSys workshop on Recommender systems and the social web (p./pp. 1--8),Dublin, Ireland: ACM.ISBN: 978-1-4503-1638-5 

Laniado, D. & Mika, P. (2010). Making Sense of Twitter.. In P. F. Patel-Schneider, Y. Pan, P. Hitzler, P. Mika, L. Zhang, J. Z. Pan, I. Horrocks & B. Glimm (eds.), International Semantic Web Conference (1) (p./pp. 470-485),: Springer.ISBN: 978-3-642-17745-3 
, Y., Zhang, B., Gao, K., Guo, P. & Sun, D. (2012). Combining content and relation analysis for recommendation in social tagging systems. Physica A: Statistical Mechanics and its Applications, 391, 5759 - 5768.  doi: 10.1016/j.physa.2012.05.013

Zubiaga, A., Fresno, V., Martinez, R. & Garcia-Plaza, A. P. (2012). Harnessing Folksonomies to Produce a Social Classification of Resources. IEEE Transactions on Knowledge and Data Engineering, 99.  doi: http://doi.ieeecomputersociety.org/10.1109/TKDE.2012.115

Landia, N., Doerfel, S., Jäschke, R., Anand, S. S., Hotho, A. & Griffiths, N. (2013). Deeper Into the Folksonomy Graph: FolkRank Adaptations and Extensions for Improved Tag Recommendations. cs.IR, 1310.1498. 

Mueller, J., Doerfel, S., Becker, M., Hotho, A. & Stumme, G. (2013). Tag Recommendations for SensorFolkSonomies. Recommender Systems and the Social Web Workshop at 7th ACM Conference on Recommender Systems, RecSys 2013, Hong Kong, China -- October 12-16, 2013. Proceedings,: CEUR-WS.
, P., Hotho, A. & Staab, S. (2005). Learning Concept Hierarchies from Text Corpora using Formal Concept Analysis. Journal on Artificial Intelligence Research, 24, 305-339. 

Singer, P., Niebler, T., Hotho, A. & Strohmaier, M. (2014). Folksonomies. In Encyclopedia of Social Network Analysis and Mining (pp. 542--547). Springer.