TY  - RPRT
TI  - Strict and random alternation in concurrent variable-interval schedules.
AU  - Douglas Elliffe
AU  - Michael Davison
PY  - 2003
DO  - 10.1901/jeab.2003.79-65
UR  - https://pubmed.ncbi.nlm.nih.gov/12696742/
ID  - 12696742
ER  -