\begin{thebibliography}{xx}


\bibitem[CDI]{CDI} \ \\
  \href{https://code.zmaw.de/projects/cdi}
       {Climate Data Interface},
  from the
  \href{http://www.mpimet.mpg.de}
       {Max Planck Institute for Meteorologie}


\bibitem[CDO]{CDO} \ \\
  \href{https://code.zmaw.de/projects/cdo}
       {Climate Data Operators},
  from the
  \href{http://www.mpimet.mpg.de}
       {Max Planck Institute for Meteorologie}


\bibitem[ECA]{ECA} \ \\
  \href{http://eca.knmi.nl/indicesextremes/}
       {ECA indices of extremes},
  from the
  \href{http://knmi.nl/}
       {Koninklijk Nederlands Meteorologisch Instituut, KNMI)}


\end{thebibliography}
