Persaud C, Lu Y, Vila-Sanjurjo A, Campbell JL, Finley J, O'Connor M (February 2010). "Mutagenesis of the modified bases, m(5)U1939 and psi2504, in Escherichia coli 23S rRNA". Biochemical and Biophysical Research Communications. 392 (2): 223–7. doi:10.1016/j.bbrc.2010.01.021. PMID20067766.
Persaud C, Lu Y, Vila-Sanjurjo A, Campbell JL, Finley J, O'Connor M (February 2010). "Mutagenesis of the modified bases, m(5)U1939 and psi2504, in Escherichia coli 23S rRNA". Biochemical and Biophysical Research Communications. 392 (2): 223–7. doi:10.1016/j.bbrc.2010.01.021. PMID20067766.