Add reference to the DDJ article discussing a similar algorithm.
diff --git a/Doc/lib/libdifflib.tex b/Doc/lib/libdifflib.tex
index a58ae8e..aa09a9d 100644
--- a/Doc/lib/libdifflib.tex
+++ b/Doc/lib/libdifflib.tex
@@ -58,6 +58,15 @@
\end{classdesc}
+\begin{seealso}
+ \seetitle{Pattern Matching: The Gestalt Approach}{Discussion of a
+ similar algorithm by John W. Ratcliff and D. E. Metzener.
+ This was published in
+ \citetitle[http://www.ddj.com/]{Dr. Dobb's Journal} in
+ July, 1988.}
+\end{seealso}
+
+
\subsection{SequenceMatcher Objects \label{sequence-matcher}}
\begin{classdesc}{SequenceMatcher}{\optional{isjunk\optional{,