@phdthesis{oai:tsukuba.repo.nii.ac.jp:00021015,
 author = {池田, 宏一郎 and Ikeda, Koichiro},
 month = {},
 note = {1993},
 school = {筑波大学, University of Tsukuba},
 title = {On minimal models},
 year = {1994}
}