Volgen op een afstand 1975-1979 : Cognitieve ontwikkeling moeilijk lerenden

The study is concerned with the cognitive development of mentally retarded young persons. These persons are compared with a control group, including a replication after three...本研究聚焦于智力障碍青年（mentally retarded young persons）的认知发展。研究将该群体与对照组进行对比分析，并包含了三年后的重复研究（原文后续内容未完整呈现）。