Johansen J, Rasmussen AA, Overgaard M, Valentin-Hansen P (2006). "Conserved small non-coding RNAs that belong to the sigmaE regulon: role in down-regulation of outer membrane proteins". J Mol Biol. 364 (1): 1–8. doi:10.1016/j.jmb.2006.09.004. PMID17007876.
Johansen J, Rasmussen AA, Overgaard M, Valentin-Hansen P (2006). "Conserved small non-coding RNAs that belong to the sigmaE regulon: role in down-regulation of outer membrane proteins". J Mol Biol. 364 (1): 1–8. doi:10.1016/j.jmb.2006.09.004. PMID17007876.