T. Gollub, B. Stein, S. Burrows, and D. Hoppe. 9th International Workshop on Text-based Information Retrieval (TIR 12) at DEXA, page 151-155. Los Alamitos, California, IEEE, (September 2012)
D. Hoppe. Proceedings of the Schloss Dagstuhl Seminar on Challenges in Document Mining, page 81. Wadern, Germany, Leibniz-Zentrum für Informatik, (April 2011)Invited talk.