@article{oai:tsukuba.repo.nii.ac.jp:00021902, author = {井田, 範美 and Ida, Noriyoshi}, issue = {2}, journal = {心身障害学研究}, month = {Mar}, pages = {69--75}, title = {精神遅滞児の数の発達及びその指導的問題(第二報)}, volume = {7}, year = {1983} }