@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040286,
 author = {Takagi, Hiromichi},
 issue = {1},
 journal = {Journal of mathematical sciences, the University of Tokyo},
 month = {},
 note = {application/pdf},
 pages = {149--164},
 title = {Remarks on Gorenstein Terminal Fourfold Flips},
 volume = {5},
 year = {1998}
}