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References
- ↑ "History - Herrenknecht AG". www.herrenknecht.com. Retrieved August 3, 2016.
- ↑ "Kennzahlen der Herrenknecht AG". Archived from the original on 2012-06-25. Retrieved 2016-08-03.
- ↑ Martin Herrenknecht Archived 2016-08-22 at the Wayback Machine CitySolutions2012
- ↑ Martin-W. Buchenau: Der Herr der Röhren. In: Handelsblatt , Nr. 200, 16. October 2010, S. 62.
- ↑ "Werner-von-Siemens-Ring für Tunnelpionier" (in German). Retrieved August 3, 2016.
- ↑ Dietmar Neuerer: Möglicher Interessenkonflikt: Mappus, S-21 und die „Spätzle-Connection“. In: Handelsblatt, 11. October 2010.
