@software{caop:software,
       key = {CAOP},
      type = {Web Site},
organization = {Work Group of Computational Mathematics, University of Kassel, Germany.},
      note = {Computer Algebra and Orthogonal Polynomials: a Web service using Maple for online
              generation of formulas and graphs of orthogonal polynomials belonging to the
              Askey scheme. For further information see \citet{Swarttouw:1997:CIA} and
              \citet{Koepf:1999:CAOP}.},
     links = {\URL[CAOP]{http://pool-serv1.mathematik.uni-kassel.de/CAOP/}}}