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COMPRESSED AIR TUNNELLING 59
                                    Acknowledgements
            This work forms part of a wider study of numerical modelling of compressed air
            tunnelling. The author would like to acknowledge his gratitude to Professor H.J.
            Bösch  from  the  Technical  University  of  Munich  for  his  valuable  co-operation
            regarding  the  field  data  and  to  the  Ministry  of  Higher  Education  of  Iran  and
            CVCP for financial support for this research.


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