Sheppard S, Lawson N, Zhu L (2013). “Accurate identification of polyadenylation sites from 3' end deep sequencing using a naive Bayes classifier.” Bioinformatics, 29(20), 2564. ISSN 1460-2059, doi:10.1093/bioinformatics/btt446, http://bioinformatics.oxfordjournals.org/content/29/20/2564.long.