1. Steiner, W. (1988): The Grauholz high-speed railway tunnel in difficult ground. Proceedings of Int. Conf. on Tunnels and Water, Madrid. Balkema, Rotterdam, Netherlands, Vol. 3, pp. 1381–1385
2. Steiner, W. and Becker, C. (1991): Grauholz tunnel in Switzerland: large mixed-face slurry shield. Proceedings of RETC, Seattle, WA., pp. 329-347
3. Steiner, W. (1993): Experience with an 11.6 m diameter Mix — Shield: The importance of the ground machine interface. Proceedings of RETC, Boston, MA., pp. 759-779
4. Jancsecz, S. (1987): Three dimensional calculation of required support pressures for the Hydroshield tunnelling in Berlin U-8, Lot D 79. (in German) Report submitted to the Senate of City Berlin, FRG. 27 th–April. 1987
5. Jancsecz, S. (1988–1992): Support pressure calculations for Mix-Shields (all in German)