Antibiotics : a survey of penicillin, streptomycin, and other antimicrobial substances from fungi, actinomycetes, bacteria, and plants / vol. 1. - Florey, H. W.; Chain, E.; Heatley, N. G.; Jennings, M. A.; Sanders, A. G.; Abraham, E. P.; Florey, M. E. (Oxford Medical Publications, 1949)