TY  - RPRT
TI  - Monitoring movement: an electronic event counter.
AU  - D Rafferty
AU  - L Brackenridge
AU  - F Bell
PY  - 1992
DO  - 10.1016/0141-5425(92)90093-z
UR  - https://pubmed.ncbi.nlm.nih.gov/1405565/
ID  - 1405565
ER  -