@article{oai:k-kentan.repo.nii.ac.jp:00001310,
 author = {尾関, 憲太郎 and OZEKI, Kentaro},
 month = {Dec},
 note = {3, KJ00000066232},
 pages = {1--4},
 title = {Pushout Squares in The Category of Topological Spaces},
 volume = {41},
 year = {1990},
 yomi = {オゼキ, ケンタロウ}
}