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3. Gellhorn, E., and Loofbourrow, G. N., Emotions and Emotional Disorders, A Neurophysiological Study (Hoeber Medical Division, Harper and Row, Publishers, New York, Evanston and London, 1963).
4. Popov, E. A., J. Neuropatol. Psychiat., 57, 545 (1957).
5. Popov, E. A., and Nevzorova, T. A., J. Neuropatol. Psychiat., 56, 559 (1956) (in Russian).