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Boer, de A., Waarts, P.H.. (2006). Comparison of Various Structural Safety Tunnel Calculations in Soft Soil . London: Taylor & Francis Group,.

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Boer, de A., Waarts, P.H.. Comparison of Various Structural Safety Tunnel Calculations in Soft Soil. London: Taylor & Francis Group,, 2006. Text.

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Boer, de A., Waarts, P.H.. Comparison of Various Structural Safety Tunnel Calculations in Soft Soil. London: Taylor & Francis Group,, 2006. Text.

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Boer, de A., Waarts, P.H.. Comparison of Various Structural Safety Tunnel Calculations in Soft Soil. London: Taylor & Francis Group,, 2006. Print.