TY  - RPRT
TI  - Categorical shape and color coding by pigeons.
AU  - T R Zentall
AU  - P Jackson-Smith
AU  - J A Jagielo
AU  - G B Nallan
PY  - 1986
UR  - https://pubmed.ncbi.nlm.nih.gov/3701264/
ID  - 3701264
ER  -