TY  - RPRT
TI  - Concept formation in an ordering task.
AU  - L H SHAFFER
PY  - 1961
DO  - 10.1111/j.2044-8295.1961.tb00801.x
UR  - https://pubmed.ncbi.nlm.nih.gov/13911110/
ID  - 13911110
ER  -