Lederberg, J.; Zinder, N. (1948). "Concentration of biochemical mutants of bacteria with penicillin". Journal of the American Chemical Society. 70 (12): 4267–4268. doi:10.1021/ja01192a521. PMID18105993.
Lederberg, J.; Zinder, N. (1948). "Concentration of biochemical mutants of bacteria with penicillin". Journal of the American Chemical Society. 70 (12): 4267–4268. doi:10.1021/ja01192a521. PMID18105993.