Tunnel de Rostock
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Feste Warnowquerung in Rostock. Dans: Bautechnik, v. 78, n. 11 (novembre 2001), pp. 838-839.
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Hehenberger, Patrick / Ziegler, Alf: Financement privé d'infrastructures routières. Dans: Tracés, n. 12, 22.06.2005.
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Hehenberger, Patrick / Baltzer, Wolfgang (2001): Fixed Crossing of the Warnow River. First DBFO Highway Concession Contract in Germany. Présenté pendant: AITES-ITA World Tunnel Congress — Progress in Tunnelling After 2000, Milan, 10-13/06/2001, pp. 201-208 (vol. III).