@article{oai:tsukuba.repo.nii.ac.jp:00015931,
 author = {Kamo, Shizuo},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {523--528},
 title = {Ideals on [omega] which are obtained from Hausdorff-gaps},
 volume = {15},
 year = {1991}
}