Performance of retarded children on a liquid conservation task: protocol objectivity and visual screening.

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@article{Langley1972PerformanceOR, title={Performance of retarded children on a liquid conservation task: protocol objectivity and visual screening.}, author={Joanne M Langley and Cheney J G Drew}, journal={American journal of mental deficiency}, year={1972}, volume={76 6}, pages={729-32} }