TY  - RPRT
TI  - Same/different abstract-concept learning by pigeons.
AU  - Jeffrey S Katz
AU  - Anthony A Wright
PY  - 2006
DO  - 10.1037/0097-7403.32.1.80
UR  - https://pubmed.ncbi.nlm.nih.gov/16435967/
ID  - 16435967
ER  -