TY  - RPRT
TI  - Spaced responding in multiple DRL schedules.
AU  - J ZIMMERMAN
AU  - C R SCHUSTER
PY  - 1962
DO  - 10.1901/jeab.1962.5-497
UR  - https://pubmed.ncbi.nlm.nih.gov/14003701/
ID  - 14003701
ER  -