Wainwright, Philip; Maddaford, Adrian; Zhang, Xiurong; Billington, Helen; Leese, David; Glen, Rebecca; Pryde, David C.; Middleton, Donald S.; Stephenson, Peter T.; Sutton, Scott Nucleosides, Nucleotides and Nucleic Acids, 2013, vol. 32, # 9 p. 477 - 492 doi: 10.1080/15257770.2013.820833