1. Extended workdays and safety;Duchon;International Journal of Industrial Ergonomics,1993
2. Is there a ‘best compromise’ shift system?;Folkard;Ergonomics,1992
3. The development and use of the Stanford Sleepiness Scale (SSS);Hoddes;Psychophysiology,1972
4. Quantification of sleepiness: a new approach;Hoddes;Psychophysiology,1973
5. The operational consequences of sleep deprivation and sleep deficit;Johnson,1974