1. Abraham, E. P., Duthie, E. S. Effect of pH of the medium on activity of streptomycin and penicillin. Lancet. 1 (1946) 455–459.
2. Albert, A. Selective toxicity, p. 178–221. Methuen & Co. Ltd. London, 1965.
3. Sabath, L. D.: Synergy of antibacterial substances by apparently known mechanisms. Antimicrob. Agents chemother. 1967 (1968) 210–217.
4. Sabath, L. D., Gerstein, D. A., Finland, M. Enhanced activity of novobiocin against gram-negative bacilli in acid media. Antimicrob. Agents Chemother. 1968 (1969) 398–404.
5. Domagk, G. Ein Beitrag zur Chemotherapie der bakteriellen Infektionen, Dtsch. med. Wschr. 61 (1935) 250–253.