TY  - RPRT
TI  - An inexpensive activity measuring device for small animals.
AU  - O D Murphree
AU  - J B Johnson
PY  - 1974
DO  - 10.1007/bf03000574
UR  - https://pubmed.ncbi.nlm.nih.gov/4850552/
ID  - 4850552
ER  -