TY  - RPRT
TI  - Two-item same-different concept learning in pigeons.
AU  - Aaron P Blaisdell
AU  - Robert G Cook
PY  - 2005
DO  - 10.3758/bf03196051
UR  - https://pubmed.ncbi.nlm.nih.gov/15971494/
ID  - 15971494
ER  -