TY  - RPRT
TI  - Successive two-item same-different discrimination and concept learning by pigeons.
AU  - Robert G. Cook
AU  - Debbie M. Kelly
AU  - Jeffrey S. Katz
PY  - 2003
DO  - 10.1016/s0376-6357(03)00022-6
UR  - https://pubmed.ncbi.nlm.nih.gov/12729974/
ID  - 12729974
ER  -