TY  - RPRT
TI  - Human choice on concurrent variable-interval variable-ratio schedules.
AU  - A Silberberg
AU  - J R Thomas
AU  - N Berendzen
PY  - 1991
DO  - 10.1901/jeab.1991.56-575
UR  - https://pubmed.ncbi.nlm.nih.gov/1774545/
ID  - 1774545
ER  -