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3. Coutts, W. E., Prats, F., Vargas-Zalazar, R., and Infante-Varas, L. (1956). Brit. J. vener. Dis., 32, 231.
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5. Elias, W., Price, A. H., and Merrion, H. J. (1951). Antibiot. and Chemother., 1, 491.