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[7]
Consideration on the choice among the different freezing methods and competitiveness of the system as compared to alternative solutions .2 F. Gallavresi. 6th International symposium on Ground Freezing . 1991
[8]
Use of artificial fund freezing in three sections of the Dusseld of subway .2 Peter Jodan,Helmt Hab. Ground Freezing,Proc 7 ISGF . 1994