TY  - JOUR
PY  - 1987//
TI  - Diurnal variation, task characteristics, and vigilance performance
JO  - Human factors
A1  - Matthews, Gerald
A1  - Davies, D. R.
A1  - Craig, A.
SP  - 675
EP  - 684
VL  - 29
IS  - 6
N2  - Abstract unavailable.
LA  - 
SN  - 0018-7208
UR  - http://dx.doi.org/
ID  - ref1
ER  -