TY  - RPRT
TI  - Category discrimination by pigeons using five polymorphous features.
AU  - L Von Fersen
AU  - S E Lea
PY  - 1990
DO  - 10.1901/jeab.1990.54-69
UR  - https://pubmed.ncbi.nlm.nih.gov/16812617/
ID  - 16812617
ER  -