海量图书期刊资源，随时随地畅享阅读乐趣
Some observations on the use of precast segmented concrete liner in urban tunnels : Foster, E L; Butler, G L Proc 5th Rapid Excavation and Tunneling Conference, San Francisco, 3–7 May 1981, V1, P498–518. Publ New York: AIME, 19811982