D. Porta. Informatik 2010: Service Science - Neue Perspektiven für die Informatik, Beiträge der 40. Jahrestagung der Gesellschaft für Informatik e.V. (GI), Band 1, volume 175 of LNI, page 497-502. GI, (September 2010)
R. Nesselrath, and D. Porta. Proceedings of the 7th IJCAI Workshop on Knowledge and Reasoning in Practical Dialogue Systems (KRPDS-11), page 37-47. (July 2011)
R. Neßelrath, and D. Porta. Proceedings of the 7th IJCAI Workshop on Knowledge and Reasoning in Practical Dialogue Systems (KRPD-11). Twenty-Second International Joint Conference On Artificial Intelligence (IJCAI -11), Barcelona, Spain, (July 2011)