Matthew Roper, and Paul Fields, "The Historical Case against Sidney Rigdon's Authorship of the Book of Mormon (A review of "Reassessing authorship of the Book of Mormon using delta and nearest shrunken centroid classification" by: Matthew L. Jockers, Daniela M. Witten, and Craig S. Criddle)," Mormon Studies Review 23/1 (2011): 113–125. off-site wiki