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Bertrand, K; Squires, C; Yanofsky, C (May 15, 1976). "Transcription termination in vivo in the leader region of the tryptophan operon of Escherichia coli.". Journal of Molecular Biology103 (2): 319–37. PMID781269. doi:10.1016/0022-2836(76)90315-6.
Johnston, H.; Roth, J. (1981). "DNA sequence changes of mutations altering attenuation control of the histidine operon of Salmonella typhimurium". Journal of Molecular Biology145 (4): 735–56. PMID6167727. doi:10.1016/0022-2836(81)90312-0.