TY  - RPRT
TI  - Circadian variability in vigilance performance.
AU  - Frazier, T. W.
AU  - Lipscomb, H. S.
AU  - Rummel, J. A.
PY  - 1968
UR  - https://ntrs.nasa.gov/citations/19680045665
ID  - 19680045665
ER  -