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3. W. D. (1944). Nav. med. Bull., Wash., 42, 1103.
4. Rossen, R. (1947). Ibid., 104, 391.
5. Cobb, W. A. (1944). J. Neurol. Psychiat., Lond., n.s. 7, Schwab, R. S. (1943). J. nerv. ment. Dis., 98, 68.