TY  - RPRT
TI  - Observing responses and informative stimuli.
AU  - R N Wilton
AU  - R O Clements
PY  - 1971
DO  - 10.1901/jeab.1971.15-199
UR  - https://pubmed.ncbi.nlm.nih.gov/16811502/
ID  - 16811502
ER  -