@phdthesis{oai:tsukuba.repo.nii.ac.jp:00020864,
 author = {奥間, 智弘 and Okuma, Tomohiro},
 month = {},
 note = {1996},
 school = {筑波大学, University of Tsukuba},
 title = {On plurigenera of two-dimensional normal singularities},
 year = {1997}
}