TY  - RPRT
TI  - Diurnal variation, task characteristics, and vigilance performance.
AU  - A Craig
AU  - D R Davies
AU  - G Matthews
PY  - 1987
DO  - 10.1177/001872088702900607
UR  - https://pubmed.ncbi.nlm.nih.gov/3436623/
ID  - 3436623
ER  -