Phillips, and Silhavy. (1992) 1992. “The E. Coli Ffh Gene Is Necessary for Viability and Efficient Protein Export”. Nature 359 (6397): 744-6. doi:10.1038/359744a0. Reference Link
Trun, and Silhavy. (1989) 1989. “PrlC, a Suppressor of Signal Sequence Mutations in Escherichia Coli, Can Direct the Insertion of the Signal Sequence into the Membrane”. J Mol Biol 205 (4): 665-76. doi:10.1016/0022-2836(89)90312-4. Reference Link