<p>More information on OPCOL, its development and its use is available in the following article:</p> <p>Cannon Jr., Robert L. \"OPCOL: an Optimal Text Collation Algorithm.\" <em>Computers and the Humanities</em> 10.1 (1976): 33-40. <a href=\"http://www.jstor.org/stable/30204218\">Web</a>.</p>