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"[...] the project will certainly result in a breakthrough in activities ranging from planning to maintenance. Contributions cover the whole spectrum of underground construction activities with an integrated approach." Tarcisio B. Celestino, University of Sao Paulo
"[...] the publication [...] is a major contribution to knowledge on advanced tunnelling techniques, and should also be noted by those in positions of power that still think that tunnelling is a nasty, dirty, low-tech pursuit." Maurice Jones, Tunnels & Tunnelling International August 2010