@article{oai:tsukuba.repo.nii.ac.jp:00017260,
 author = {Nenciu, Adriana},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {189--204},
 title = {The center construction for weak Hopf algebras},
 volume = {26},
 year = {2002}
}