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<entry id="GAPDoc"><manual>
  <author>
    <name><first>Frank</first><last>Lübeck</last></name>
    <name><first>Max</first><last>Neunhöffer</last></name>
  </author>
  <title><C>GAPDoc (Version 1.5.1)</C></title>
  <organization>RWTH Aachen</organization>
  <year>2012</year>
  <other type="note">
    GAP package, 
    <URL>http://www.math.rwth-aachen.de/~Frank.Luebeck/GAPDoc/index.html</URL>
  </other>
</manual></entry>

<entry id="GitHubPagesForGAP"><manual>
  <author>
    <name><first>Max</first><last>Horn</last></name>
  </author>
  <title><C>GitHubPagesForGAP - Template for easily using GitHub Pages within GAP packages (Version 0.1)</C></title>
  <year>2014</year>
  <other type="note">
    GAP package, <URL>https://github.com/fingolfin/GitHubPagesForGAP/</URL>
  </other>
</manual></entry>

<entry id="AlWe"><article>
  <author>
    <name><first>Murat</first><last>Alp</last></name>
    <name><first>Christopher D.</first><last>Wensley</last></name>
  </author>  
  <title>Automorphisms and homotopies of groupoids and crossed modules</title>
  <journal>Applied Categorical Structures</journal>
  <year>2010</year>
  <volume>18</volume>
  <pages>473&ndash;495</pages>
</article></entry>

<entry id="BrTop"><book>
  <author>
    <name><first>Ronald</first><last>Brown</last></name>
  </author>  
  <title>Topology: a geometric account of general topology,
         homotopy types, and the fundamental groupoid</title>
  <publisher>Ellis Horwood, Chichester</publisher>
  <year>1988</year>
</book></entry>

<entry id="BrTopGpd"><book>
  <author>
    <name><first>Ronald</first><last>Brown</last></name>
  </author>  
  <title>Topology and groupoids</title>
  <publisher>Booksurge LLC, S.Carolina</publisher>
  <year>2006</year>
</book></entry>

<entry id="BrMoPoWe"><article>
  <author>
    <name><first>Ronald</first><last>Brown</last></name>
    <name><first>Emma J.</first><last>Moore</last></name>
    <name><first>Timothy</first><last>Porter</last></name>
    <name><first>Christopher D.</first><last>Wensley</last></name>
  </author>  
  <title>Crossed complexes, and free crossed resolutions 
         for amalgamated sums and HNN-extensions of groups</title>
  <journal>Georgian Math. J.</journal>
  <year>2002</year>
  <volume>9</volume>
  <pages>623&ndash;644</pages>
</article></entry>

<entry id="HiGpd"><book>
  <author>
    <name><first>Philip</first><last>Higgins</last></name>
  </author>  
  <title>Categories and groupoids</title>
  <publisher>Reprints in Theory and Applications of Categories</publisher>
  <year>2005</year>
  <pages>1&ndash;195</pages>
  <note>
    <URL>http://www.tac.mta.ca/tac/reprints/articles/7/tr7abs.html</URL>
  </note> 
</book></entry>

<entry id="HiJLMS"><article>
  <author>
    <name><first>Philip</first><last>Higgins</last></name>
  </author>  
  <title>The fundamental groupoid of a graph of groups</title>
  <journal>J. London Math. Soc.</journal>
  <year>1976</year>
  <volume>13</volume>
  <pages>145&ndash;149</pages>
</article></entry>

<entry id="emma-thesis"><phdthesis>
  <author>
    <name><first>Emma J.</first><last>Moore</last></name>
  </author>  
  <title>Graphs of Groups: 
         Word Computations and Free Crossed Resolutions</title>
  <school>University of Wales, Bangor</school>
  <year>2001</year>
  <note>
    <URL>http://www.maths.bangor.ac.uk/research/ftp/theses/moore.ps.gz</URL>
  </note>
</phdthesis></entry>

<entry id="Serre"><book>
  <author>
    <name><first>J.</first><last>Serre</last></name>
  </author>  
  <title>Trees</title>
  <publisher>Springer-Verlag, Berlin</publisher>
  <year>1980</year>
</book></entry>

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