Wilhelm-Schickard-Institut fur Informatik, Sand 14, 72076 Tübingen, Germany. Martin.Schmollinger@fh-furtwangen.de|Wilhelm-Schickard-Institut fur Informatik, Sand 14, 72076 Tübingen, Germany. Martin.Schmollinger@fh-furtwangen.de|Wilhelm-Schickard-Institut fur Informatik, Sand 14, 72076 Tübingen, Germany. Martin.Schmollinger@fh-furtwangen.de|Wilhelm-Schickard-Institut fur Informatik, Sand 14, 72076 Tübingen, Germany. Martin.Schmollinger@fh-furtwangen.de