R. G. Jacob, S. R. Woody, D. B. Clark, S. O. Lilienfeld, B. E. Hirsch, G. D. Kucera, et al. Discomfort with space and motion: A possible marker of vestibular dysfunction assessed by the situational characteristics questionnaire. Journal of Psychopathology and Behavioral Assessment, 1993, 15(4): 299-324.