@article{oai:tsukuba.repo.nii.ac.jp:00016295,
 author = {Eda, Katsuya and Sakai, Katsuro},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {351--387},
 title = {A factor of singular homology},
 volume = {15},
 year = {1991}
}