@article{oai:tohoku.repo.nii.ac.jp:00139050,
 author = {後藤, 嘉也},
 journal = {思索, SHISAKU},
 month = {Sep},
 note = {紀要類（bulletin）},
 pages = {85--104},
 title = {循環とその外部},
 volume = {31},
 year = {1998}
}