@misc{oai:tsukuba.repo.nii.ac.jp:00012427,
 author = {増岡, 彰 and Masuoka, Akira},
 month = {},
 note = {1992, 【要旨】},
 title = {Faithful flatness, freeness and cleftness of Hopf algebras},
 year = {1992}
}