Standardization of a new batch of purified tuberculin (PPD) intended for international use

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Guld, Johannes, Bentzon, M. Weis, Bleiker, M. A., Griep, W. A., Magnusson, Mogens. et al. (1958). Standardization of a new batch of purified tuberculin (PPD) intended for international use. Bulletin of the World Health Organization, 19 (5), 845 - 951. http://www.who.int/iris/handle/10665/265345