TY  - RPRT
TI  - Activity level: a comparison between actometer scores and observer ratings.
AU  - T M Stevens
AU  - M J Kupst
AU  - B G Suran
AU  - J L Schulman
PY  - 1978
DO  - 10.1007/bf00919122
UR  - https://pubmed.ncbi.nlm.nih.gov/670584/
ID  - 670584
ER  -