TY  - RPRT
TI  - The effect of varying task difficulty on subjective workload
AU  - Yeh, Y.-Y.
AU  - Wickens, C. D.
AU  - Hart, S. G.
PY  - 1985
UR  - https://ntrs.nasa.gov/citations/19860049070
ID  - 19860049070
ER  -