Sinfield, J.V., and Einstein, H.H. (1998). Tunnel construction costs for tube transportation systems. Construction Engineering and Management, 124 (1), 48-57. doi:10.1061/(ASCE)0733-9364(1998)124:1(48)
Sinfield, J.V., and Einstein, H.H. (1998). Tunnel construction costs for tube transportation systems. Construction Engineering and Management, 124 (1), 48-57. doi:10.1061/(ASCE)0733-9364(1998)124:1(48)