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2. Bertrand, I., and van Bogaert, L. (1934). Enchephale, 29, 505.
3. Bielschowsky, M. (1921). J. Psychol. Neurol., 26, 123.
4. Bielschowsky, M. (1928). Ibid., 36, 103.
5. Bielschowsky, M., and Henneberg, R. (1928). Ibid., 36, 131.