@article{oai:tsukuba.repo.nii.ac.jp:00017326,
 author = {Sakai, Katsuro and Uehara, Shigenori},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {69--80},
 title = {Spaces of upper semi-continuous multi-valued functions on separable metric spaces},
 volume = {24},
 year = {2000}
}