@article{oai:rose-ibadai.repo.nii.ac.jp:00009678,
 author = {MATSUDA, Ryuki},
 issue = {39},
 journal = {Mathematical journal of Ibaraki University},
 month = {May},
 note = {application/pdf, text/plain, 論文(Article)},
 pages = {11--22},
 title = {Note on the number of semistar operations, XI},
 year = {2007}
}