TY  - RPRT
TI  - Variable-interval schedule performance in open and closed economies.
AU  - G A Hall
AU  - K A Lattal
PY  - 1990
DO  - 10.1901/jeab.1990.54-13
UR  - https://pubmed.ncbi.nlm.nih.gov/16812613/
ID  - 16812613
ER  -