@article{oai:tsukuba.repo.nii.ac.jp:00017286,
 author = {Yamatani, Norifumi},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {339--349},
 title = {S＾4-formula and  S＾2-formula for quasi-triangular biFrobenius algebras},
 volume = {26},
 year = {2002}
}