| 2001 | RE | Requirements Archaeology: From Unstructured Information to High Quality Specifications. | Friedemann Kiedaisch, Martin Pohl, Joachim Weisbrod, Siegfried Bauer, Stefan Ortmanns |
| 1999 | ICASSP | Dynamic programming search techniques for across-word modelling in speech recognition. | Klaus Beulen, Stefan Ortmanns, Christian Elting |
| 1999 | ICASSP | High quality word graphs using forward-backward pruning. | Achim Sixtus, Stefan Ortmanns |
| 1999 | Interspeech | An efficient decoding method for real time speech recognition. | Stefan Ortmanns, Wolfgang Reichl, Wu Chou |
| 1998 | ICASSP | The RWTH large vocabulary continuous speech recognition system. | Hermann Ney, Lutz Welling, Stefan Ortmanns, Klaus Beulen, Frank Wessel |
| 1998 | ICASSP | Improved lexical tree search for large vocabulary speech recognition. | Stefan Ortmanns, Andreas Eiden, Hermann Ney |
| 1997 | GI | Architecture and Search Organization for Large Vocabulary Continuous Speech Recognition. | Stefan Ortmanns, Lutz Welling, Klaus Beulen, Frank Wessel, Hermann Ney |
| 1997 | ICASSP | Extensions to the word graph method for large vocabulary continuous speech recognition. | Hermann Ney, Stefan Ortmanns, Ingo Lindam |
| 1997 | ICASSP | Look-ahead techniques for fast beam search. | Stefan Ortmanns, Andreas Eiden, Hermann Ney, Norbert Coenen |
| 1997 | Interspeech | Fast likelihood computation methods for continuous mixture densities in large vocabulary speech recognition. | Stefan Ortmanns, Thorsten Firzlaff, Hermann Ney |
| 1996 | Interspeech | Language-model look-ahead for large vocabulary speech recognition. | Stefan Ortmanns, Hermann Ney, Andreas Eiden |
| 1996 | Interspeech | A comparison of time conditioned and word conditioned search techniques for large vocabulary speech recognition. | Stefan Ortmanns, Hermann Ney, Frank Seide, Ingo Lindam |
| 1995 | Interspeech | Experimental analysis of the search space for 20 000-word speech recognition. | Stefan Ortmanns, Hermann Ney |