Ruiz, Natividad, and Thomas Silhavy. (2003) 2003. “Constitutive Activation of the Escherichia Coli Pho Regulon Upregulates RpoS Translation in an Hfq-Dependent Fashion”. J Bacteriol 185 (20): 5984-92. doi:10.1128/JB.185.20.5984-5992.2003. Reference Link