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\expandafter\ifx\csname natexlab\endcsname\relax\def\natexlab#1{#1}\fi
\expandafter\ifx\csname url\endcsname\relax
  \def\url#1{{\tt #1}}\fi

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\newblock A support vector clustering method.
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\newblock A support vector clustering method.
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\newblock {\em Algorithms for clustering data}.
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\end{thebibliography}