@article{oai:tsukuba.repo.nii.ac.jp:00048821, author = {CHINEN, Naotsugu and HOSAKA, Tetsuya}, issue = {2}, journal = {Tsukuba Journal of Mathematics}, month = {Dec}, pages = {185--191}, title = {Asymptotic dimension and boundary dimension of proper CAT(0) spaces}, volume = {36}, year = {2012} }