Update README.md

README.md

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     <div class="section-content">
 	  This model was merged using the following merge methods:<br><ul>
 	  <li><a href="https://arxiv.org/abs/2306.01708">[TIES]</a></li>
-	  <li><a href="https://en.wikipedia.org/wiki/Karcher_mean">[Karcher Mean]</a></li>
+	  <li><a href="https://arxiv.org/abs/2603.04972">[Karcher Mean]</a></li>
 	  <li><a href="https://arxiv.org/abs/2406.11617">[DELLA]</a></li>
 	  <li><a href="https://arxiv.org/abs/2408.07990">[SCE]</a></li>
 	  </ul>