4) GRAYBIEL A. Diagnostic Criteria for Grading the Severity of Acute Motion Sickness. Aerospace Med.. (1968) vol.May, p.453-455.
5) GRAYBIEL A. Evaluation of the Relationship between Motion Sickness Sympto-matology and Blood Pressure, Heart Rate, and Body Temperature. Aviat. Space and Environ. Med.. (1980) vol.51, p.211-214.