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Дополнительную информацию можно найти в следующих книгах и статьях: Levenson, R. W., Ekman, P., Heider, К. & Friesen, W. V. 1992. «Emotion and autonomic nervous system activity in the Minangkabau of West Sumatra». Journal of Personality and Social Psychology, 62: 972–988. Levenson, R. W., Carstensen, L. L., Friesen, W. V. & Ekman, P. 1991. «Emotion, physiology, and expression in old age». Psychology and Aging, 6:28–35. Levenson, R. W., Ekman, P. & Friesen, W. V. 1990. «Voluntary facial action generates emotion–specific autonomic nervous system activity». Psychophysiology, 27: 363–384. Ekman, P., Levenson, R. W. & Friesen, W. V. 1983. «Autonomic nervous system activity distinguishes between emotions». Science, 221: 1208–1210. Ekman, P. & Davidson, R. 1994. The Nature of Emotion: Fundamental Questions. New York: Oxford University Press. Ekman, P. & Davidson, R. J. 1993. «Voluntary smiling changes regional brain activity». Psychological Science, 4: 342–345. Davidson, R. J., Ekman, P., Saron, C., Senulis, J. & Friesen, W. V. 1990. «Emotional expression and brain physiology I: Approach/with drawal and cerebral asymmetry». Journal of Personality and Social Psychology, 58: 330–341. Ekman, P., Davidson, R. J. & Friesen, W. V. 1990. «Emotional expression and brain physiology II: The Duchenne smile». Journal of Personality and Social Psychology, 58: 342–353.