1. Attewell P. B. (1977). “Ground movements caused by tunnelling in soil.” Proc. Int. Conf. on Large Ground Movements and Struct. Pentech Press London England 812–948.
2. Attewell P. B. and Woodman J. P. (1982). “Predicting the dynamics of ground settlements and its derivatives caused by tunnelling in soil.” Ground Engrg. London England 15(8) 13–22 36.
3. Cording E. J. and Hansmire W. H. (1975). “Displacement around soft ground tunnels.” 5th Pan Am. Conf. on SMFE Buenos Aires Vol. 4 571–633.
4. Subsurface settlement profiles above tunnels in clays
5. Negro A. and Kochen R. (1996). “Numerical modelling of a tunnel in soft porous clay.” Proc. Symp. on Geotech. Aspects of Underground Constr. in Soft Ground City University London Thomas Telford Ltd. London England.