TY  - RPRT
TI  - Pigeons flexibly time or count on cue.
AU  - W A Roberts
AU  - R Coughlin
AU  - S Roberts
PY  - 2000
DO  - 10.1111/1467-9280.00244
UR  - https://pubmed.ncbi.nlm.nih.gov/11273406/
ID  - 11273406
ER  -