1. Booth, J. C.: Venereal diseases in Australia in the post-war decade, 1945–1955. Brit. J. vener. Dis. 32, 154 (1956).
2. Durel, P.: Survey of the venereal disease situation in France. Brit. J. vener. Dis. 32, 145 (1956).
3. Gjessing, H. C.: Venereal diseases past and present in Norway with special reference to Oslo. Brit. J. vener. Dis. 32, 86 (1956).
4. Guthe, T., and R. R. Willcox: Treponematoses. W. H. O. Publication, p. 10 and p. 11, 1954.
5. Koshewnikov, P. V.: Organization of syphilis control in the Soviet Union. Brit. J. vener. Dis. 32, 229 (1956).