TY  - RPRT
TI  - Infant chimpanzees spontaneously perceive both concrete and abstract same/different relations.
AU  - D L Oden
AU  - R K Thompson
AU  - D Premack
PY  - 1990
UR  - https://pubmed.ncbi.nlm.nih.gov/2364739/
ID  - 2364739
ER  -