4Tsuji H,Sawada T,Takizawa M.Extraordinary InundationAccidents in the Seikan Undersea Tunnel. InternationalJournal of Rock Mechanics and Mining Sciences andGeomechanics Abstracts . 1996
5Soren Degn Eskesen,Per Tengborg,Jorgen Kampmann,Trine Hoist Veicherts.Guidelines for tunnelling risk management: International Tunneling Association, Working Group No.2. Tunnelling and Underground Space Technology . 2004
