标题:精神薄弱児における学習能の構造と学習の条件 : 4.精神薄弱 [in Japanese] The structure of learning ability of the mentally retarded. : LIST OF PAPERS PRESENTED AT THE THIRD ANNUAL CONVENTION OF THE JAPANESE ASSOCIATION OF EDUCATIONAL PSYCHOLOGY October 17-21,1961,Nagoya : Division 3 : Mentally Retarded [in Japanese]