@article{oai:iwate-u.repo.nii.ac.jp:00012227,
 author = {SASAKI, Morio},
 journal = {岩手大学教育学部研究年報 = Annual report of the Faculty of Education, University of Iwate},
 month = {Jan},
 pages = {17--18},
 title = {Note on the isomorphism problem of N-semigroups},
 volume = {28},
 year = {1969}
}