TY  - RPRT
TI  - Key-peck probability and topography in a concurrent variable-interval variable-interval schedule with food and water reinforcers.
AU  - B O Ploog
AU  - H P Zeigler
PY  - 1997
DO  - 10.1901/jeab.1997.67-109
UR  - https://pubmed.ncbi.nlm.nih.gov/9037783/
ID  - 9037783
ER  -