diff --git a/test/data/software/reference.xml b/test/data/software/reference.xml
index 401186b..4e7beb5 100644
--- a/test/data/software/reference.xml
+++ b/test/data/software/reference.xml
@@ -41,6 +41,85 @@
     <alternateIdentifier alternateIdentifierType="url">https://zbmath.org/software/?q=si%3A2</alternateIdentifier>
   </alternateIdentifiers>
 
-
+ <related_software>
+      <id>4013</id>
+      <name>MUMPS</name>
+    </related_software>
+    <related_software>
+      <id>4012</id>
+      <name>PETSc</name>
+    </related_software>
+    <related_software>
+      <id>930</id>
+      <name>SuperLU</name>
+    </related_software>
+    <related_software>
+      <id>4629</id>
+      <name>SparseMatrix</name>
+    </related_software>
+    <related_software>
+      <id>503</id>
+      <name>LAPACK</name>
+    </related_software>
+    <related_software>
+      <id>679</id>
+      <name>PARDISO</name>
+    </related_software>
+    <related_software>
+      <id>426</id>
+      <name>hypre</name>
+    </related_software>
+    <related_software>
+      <id>989</id>
+      <name>UMFPACK</name>
+    </related_software>
+    <related_software>
+      <id>4089</id>
+      <name>METIS</name>
+    </related_software>
+    <related_software>
+      <id>4028</id>
+      <name>Trilinos</name>
+    </related_software>
+    <related_software>
+      <id>830</id>
+      <name>ScaLAPACK</name>
+    </related_software>
+    <related_software>
+      <id>4827</id>
+      <name>mctoolbox</name>
+    </related_software>
+    <related_software>
+      <id>6749</id>
+      <name>WSMP</name>
+    </related_software>
+    <related_software>
+      <id>3216</id>
+      <name>BLAS</name>
+    </related_software>
+    <related_software>
+      <id>418</id>
+      <name>HSL</name>
+    </related_software>
+    <related_software>
+      <id>8067</id>
+      <name>ML</name>
+    </related_software>
+    <related_software>
+      <id>2780</id>
+      <name>SPIKE</name>
+    </related_software>
+    <related_software>
+      <id>6496</id>
+      <name>MPI</name>
+    </related_software>
+    <related_software>
+      <id>9043</id>
+      <name>MFEM</name>
+    </related_software>
+    <related_software>
+      <id>17483</id>
+      <name>STRUMPACK</name>
+    </related_software>
 
 </resource>
\ No newline at end of file