An unsupervised hierarchical approach to document categorization. - Robert Wetzker; Tansu Alpcan; Christian Bauckhage; Winfried Umbrath; Sahin Albayrak (Web Intelligence, 2007)

An Ontology-Based Approach to Text Summarization. - Leonhard Hennig; Winfried Umbrath; Robert Wetzker (Web Intelligence/IAT Workshops, 2008)

Tailoring Taxonomies for Efficient Text Categorization and Expert Finding. - Robert Wetzker; Winfried Umbrath; Leonhard Hennig; Christian Bauckhage; Tansu Alpcan; Florian Metze (Web Intelligence/IAT Workshops, 2008)

Image retrieval and Web 2.0 - where can we go from here? - Christian Bauckhage; Tansu Alpcan; Robert Wetzker; Winfried Umbrath (ICIP, 2008)

The Universal Recommender - Jérôme Kunegis; Alan Said; Winfried Umbrath (CoRR, 2009)