1. Guinea pigs vs. man in standardization of tuberculin;Edsall,1961
2. Standardization of a new batch of PPD;Guld;Bulletin of the World Health Organization,1958
3. Assessment of the potency of tuberculin in humans and guinea pigs;Hansen;Bulletin of the World Health Organization,1964
4. Adsorption of tuberculin PPD to glass and plastic surfaces;Landi;Bulletin of the World Health Organization,1966