1. 1) Szechy, K.: The Art of Tunnelling, Akademia Kiado Budapest, 1967.
2. 2) Schmidt, B.: Settlements and Ground Movements Associated with Tunnelling in Soil, Ph. D. Thesis, Univ. of Illinois, Urbana, 1969.
3. 3) Peck, R. B.: Deep Excavations and Tunnelling in Soft Ground, Proc. 7th ICSMFE, Mexico City, Mexico, pp. 225-290, 1969.
4. 4) Attewell, P. B.: Engineering Contract, Site Investigation and Surface Movements in Tunnelling Works, Soft-Ground Tunnelling-Failures and Displacements, A. A. Balkema, pp. 5-12, 1981.
5. 5) O'Reilly, M. P. and New, B. M.: Settlements above Tunnels in the United Kingdom-Their Magnitude and Prediction, Tunnelling '82, The Institution of Miningand Metallurgy pp. 173-181, 1982.