Einstein, H.H. (1999). Tunnels in Opalinus clayshale – case histories and new developments. In: Proceedings of the 37th U.S. Symposium on Rock Mechanics (USRMS), 7-9 June, Vail, Colorado. ARMA-99-0049
Einstein, H.H. (1999). Tunnels in Opalinus clayshale – case histories and new developments. In: Proceedings of the 37th U.S. Symposium on Rock Mechanics (USRMS), 7-9 June, Vail, Colorado. ARMA-99-0049