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<entry id="Higman59"><article>
  <author>
    <name><first>G.</first><last>Higman</last></name>
  </author>  
  <title>Some remarks on varieties of groups</title>
  <journal>Quart. J. Math. Oxford</journal>
  <year>1959</year>
  <volume>2</volume>
  <number>10</number>
  <pages>165&ndash;178</pages>
</article></entry>

<entry id="LS90"><article>
  <author>
    <name><first>C. R.</first><last>Leedham-Green</last></name>
    <name><first>L. H.</first><last>Soicher</last></name>
  </author>  
  <title>Collection from the left and other strategies</title>
  <journal>J. Symbolic Comput.</journal>
  <year>1990</year>
  <volume>9</volume>
  <number>5&ndash;6</number>
  <pages>665&ndash;675</pages>
</article></entry>

<entry id="NewmanNickel94"><article>
  <author>
    <name><first>M. F.</first><last>Newman</last></name>
    <name><first>Werner</first><last>Nickel</last></name>
  </author>  
  <title>Engel elements in groups</title>
  <journal>J. Pure Appl. Algebra</journal>
  <year>1994</year>
  <volume>96</volume>
  <pages>39&ndash;45</pages>
</article></entry>

<entry id="Nickel96"><inproceedings>
  <author>
    <name><first>Werner</first><last>Nickel</last></name>
  </author>  
  <title>Computing Nilpotent Quotients of Finitely Presented Groups</title>
  <booktitle>Geometric and Computational Perspectives on Infinite
      Groups</booktitle>
  <year>1996</year>
  <volume>25</volume>
  <series>Dimacs Series in Discrete Mathematics and Theoretical Computer
      Science</series>
  <pages>175&ndash;191</pages>
</inproceedings></entry>

<entry id="Sims94"><book>
  <author>
    <name><first>C. C.</first><last>Sims</last></name>
  </author>  
  <title>Computation with Finitely Presented Groups</title>
  <publisher>Cambridge University Press</publisher>
  <year>1994</year>
</book></entry>

<entry id="VL90a"><article>
  <author>
    <name><first>M. R.</first><last>Vaughan-Lee</last></name>
  </author>  
  <title>Collection from the Left</title>
  <journal>J. Symbolic Comput.</journal>
  <year>1990</year>
  <volume>9</volume>
  <pages>725&ndash;733</pages>
  <other type="publisher">Academic Press</other>
</article></entry>

<entry id="polycyclic"><misc>
  <author>
    <name><first>Bettina</first><last>Eick</last></name>
    <name><first>Werner</first><last>Nickel</last></name>
  </author>  
  <title><Wrap Name="Package">Polycyclic</Wrap>,
         Algorithms for working with polycyclic groups</title>
  <howpublished><URL>https://gap-packages.github.io/polycyclic/</URL></howpublished>
  <year>2002</year>
  <note><Wrap Name="Package">GAP</Wrap> package</note>
</misc></entry>

<entry id="GNUMP"><manual>
  <title>GNU MP</title>
  <address><URL>https://gmplib.org/</URL></address>
  <key>GMP</key>
</manual></entry>

<entry id="GAP4"><manual>
  <title><C>GAP</C> -- <C>G</C>roups, <C>A</C>lgorithms, and 
                  <C>P</C>rogramming, Version 4.11.1</title>
  <organization>The GAP Group</organization>
  <year>2021</year>
  <note><URL>https://www.gap-system.org</URL></note>
  <key>GAP</key>
  <keywords>groups; *; gap; manual</keywords>
</manual></entry>


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