@article{oai:tsukuba.repo.nii.ac.jp:00015845,
 author = {Yasugi, Mariko},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {97--114},
 title = {A two-storied universe of transfinite mechanisms},
 volume = {12},
 year = {1988}
}