TY  - RPRT
TI  - Learning when reward is delayed: a marking hypothesis.
AU  - D A Lieberman
AU  - D C McIntosh
AU  - G V Thomas
PY  - 1979
DO  - 10.1037//0097-7403.5.3.224
UR  - https://pubmed.ncbi.nlm.nih.gov/528888/
ID  - 528888
ER  -