@article{oai:fukuoka-u.repo.nii.ac.jp:00002300,
 author = {Nakaoka, Fumie and Oda, Nobuyuki},
 issue = {1},
 journal = {福岡大学理学集報, Fukuoka University Science Reports},
 month = {Mar},
 note = {application/pdf},
 pages = {1--7},
 title = {Maximal Objects and Minimal Objects in the Sets with Operations},
 volume = {45},
 year = {2015}
}