@software{gap:software,
       key = {GAP},
      type = {Web Site},
organization = {The GAP Group, Centre for Interdisciplinary Research in Computational Algebra,
                University of St. Andrews, United Kingdom.},
      note = {Groups, Algorithms, Programming:
              A system for computational discrete
              algebra with emphasis on computational group theory.},
     links = {\URL[GAP]{http://www.gap-system.org/~gap/}}}