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@@ -14134,7 +14134,8 @@ See also:
 <li><a href="#eig_sym">eig_sym()</a></li>
 <li><a href="#svds">svds()</a></li>
 <li><a href="#is_symmetric">.is_symmetric()</a></li>
-<li><a href="https://www.caam.rice.edu/software/ARPACK/UG/node33.html">shift-invert mode in ARPACK</a></li>
+<!-- <li><a href="https://www.caam.rice.edu/software/ARPACK/UG/node33.html">shift-invert mode in ARPACK</a></li> -->
+<a href="https://li.mit.edu/Archive/Activities/Archive/CourseWork/Ju_Li/MITCourses/18.335/Doc/ARPACK/Lehoucq97.pdf">shift-invert mode in ARPACK</a>
 <li><a href="https://mathworld.wolfram.com/EigenDecomposition.html">eigen decomposition in MathWorld</a></li>
 <li><a href="https://en.wikipedia.org/wiki/Eigenvalues_and_eigenvectors">eigenvalues &amp; eigenvectors in Wikipedia</a></li>
 </ul>