Muraki, Yoshinao (1997). The umbrella method in tunnelling. M.S. thesis, Massachusetts Institute of Technology. URI: https://dspace.mit.edu/handle/1721.1/10740
Muraki, Yoshinao (1997). The umbrella method in tunnelling. M.S. thesis, Massachusetts Institute of Technology. URI: https://dspace.mit.edu/handle/1721.1/10740