Margery Perham
<p>
<a href="http://www.britac.ac.uk/pubs/proc/files/111p617.pdf">http://www.britac.ac.uk/pubs/proc/files/111p617.pdf</a></p>
<p><img src="/066bbdad-9e0d-56e8-9681-d4e796ca0b06.png" />
<a href="http://www.tandfonline.com/na101/home/literatum/publisher/tandf/journals/content/fich20/1991/fich20.v019.i03/03086539108582857/production/03086539108582857.fp.png_v03">http://www.tandfonline.com/na101/home/literatum/publisher/tandf/journals/content/fich20/1991/fich20.v019.i03/03086539108582857/production/03086539108582857.fp.png_v03</a>http://www.tandfonline.com/doi/abs/10.1080/03086539108582857?journalCode=fich20</p>
<p>
<img src="/4d012f10-485c-4d64-9d0e-62cfdc62b720.png" /> </p>