1. ^{{cite journal | vauthors = Yan F, LaMarre JM, Röhrich R, Wiesner J, Jomaa H, Mankin AS, Fujimori DG | title = RlmN and Cfr are radical SAM enzymes involved in methylation of ribosomal RNA | journal = Journal of the American Chemical Society | volume = 132 | issue = 11 | pages = 3953–64 | date = March 2010 | pmid = 20184321 | pmc = 2859901 | doi = 10.1021/ja910850y }}
2. ^{{cite journal | vauthors = Giessing AM, Jensen SS, Rasmussen A, Hansen LH, Gondela A, Long K, Vester B, Kirpekar F | title = Identification of 8-methyladenosine as the modification catalyzed by the radical SAM methyltransferase Cfr that confers antibiotic resistance in bacteria | journal = RNA | volume = 15 | issue = 2 | pages = 327–36 | date = February 2009 | pmid = 19144912 | pmc = 2648713 | doi = 10.1261/rna.1371409 }}
3. ^{{cite journal | vauthors = Kaminska KH, Purta E, Hansen LH, Bujnicki JM, Vester B, Long KS | title = Insights into the structure, function and evolution of the radical-SAM 23S rRNA methyltransferase Cfr that confers antibiotic resistance in bacteria | journal = Nucleic Acids Research | volume = 38 | issue = 5 | pages = 1652–63 | date = March 2010 | pmid = 20007606 | pmc = 2836569 | doi = 10.1093/nar/gkp1142 }}