1. Guinea pigs vs. man in standardization of tuberculin;Edsall,1961
2. Disparities of tuberculins;Grzybowski;American Review of Respiratory Diseases,1969
3. Standardization of a new batch of PPD;Guld;Bulletin of the World Health Organization,1958
4. Assessment of the potency of tuberculin in humans and guinea pigs;Hansen;Bulletin of the World Health Organization,1964