@article{oai:tsukuba.repo.nii.ac.jp:00017133, author = {Chatyrko, Vitalij A. and Hattori, Yasunao}, issue = {2}, journal = {Tsukuba Journal of Mathematics}, month = {Dec}, pages = {221--228}, title = {Estimations of small transfinite dimension in separable metrizable spaces}, volume = {25}, year = {2001} }