quite a few monthly update, version 1.3

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@@ -119,7 +119,7 @@ steepness of the sides of the pile</p>
 <p>inclined slope: similar to the previous, a <em>pile of sand</em> (coulomb
 friction again) flowing down an inclined plane. This test enables comparison
 to a solution described in
-<a href="https://link.springer.com/article/10.1007/BF01176861">Savage-Hutter 1993</a>
+<a href="https://link.springer.com/article/10.1007/BF01176861">Savage-Hutter 1993</a> 
 in which the depth and velocity profiles can be determined in an analytical
 form.</p>
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