1. Eggemeier, F. T. & Wilson, G. F. (1991). Performance and subjective measures of workload in multitask environments. In D. Damos (Ed.), Multiple-task performance (pp. 217-278). London: Taylor & Francis.
2. Hankins, T. C. & Wilson, G. F. (1998). A comparison of heart rate, eye activity, EEG and subjective measures of pilot mental workload during flight. Aviation, Space, and Environmental Medicine, 69, 360-367.
3. Hart, S. G. & Hauser, J. R. (1987). In-flight application of three pilot workload measurement techniques. Aviation, Space, and Environmental Medicine, 58, 402-410.
4. Heart Rate Averages as Workload/Fatigue Indicators during OT&E
5. Roscoe, A. H. (1975). Heart rate monitoring of pilots during steep-gradient approaches. Aviation, Space, and Environmental Medicine, 11, 1410-1413.