AMERICAN PSYCHIATRIC ASSOCIATION, ed. American psychiatric association diagnostic and statistical manual of mental disorders. 1994
ALPERT, M. Reflections of depression in acoustic measures of the patient's speech. J. Affective Disorders. 2001, 66, 59-69
ELLGRING, H. Vocal indicators of mood change in depression. J. Nonverbal Behavior. 1996, 20, 2, 83-110
SCHERER, K. R. Vocal affect expression : A review and a model for future research. Psychological Bulletin. 1986, 99, 143-165
SEIGMAN, A. W. Voices of fear and anxiety and sadness and depression : The effects of speech rate and loudness on fear and anxiety and sadness and depression. J. Abnormal Psychology. 1993, 102, 3, 430-437