This and similar theories have been dismissed on a number of counts, with some citing that Stephen would have been unable to commit any murders in London and return to Cambridge in time for lectures the following morning. Harrison had also connected Stephen's handwriting with the Ripper letters "From Hell" and "Dear Boss", and that the internal style of some of Stephen's poems matches some of the anonymous Ripper letters. This connection was rebutted by Thomas J. Mann in an article in the "Journal of the World Association of Document Examiners" (June 1975) in which Mann determines that only the Lusk letter is likely to be genuine and that the connection between Stephen's handwriting and that letter was minimal: ""The overwhelming evidence is that the two do not match; and if the author of the Lusk letter was indeed Jack the Ripper, then J.K. Stephen was not that man.""