1. In British Surgical Practice;Curran, D.; Partridge, M.,1952
2. Lange, J. (1928). In Handbuch der Geisteskrankheiten, ed. 0. Bumke, Vol. 6.
3. Lewis, A. J. (1934). J. ment. Sci., 80, 277.
4. Mayer-Gross, W., Slater, E. T. O.. and Roth, M. (1954). Clinical
5. Pippard, J. (1955). J. ment. Sci., 101, 756.