\begin{thebibliography}{GDT91}

\bibitem[GDT91]{GDT91}
Ernst~M. Gabidulin, Alexander~A. Davydov, and Leonid~M. Tombak.
\newblock Linear codes with covering radius $2$ and other new covering codes.
\newblock {\em IEEE Trans. Inform. Theory}, 37(1):219--224, 1991.

\bibitem[Leo91]{Leon91}
Jeffrey~S. Leon.
\newblock Permutation group algorithms based on partitions, {I}: theory and
  algorithms.
\newblock {\em J. Symbolic Comput.}, 12:533--583, 1991.

\end{thebibliography}
