\begin{thebibliography}{15}
\expandafter\ifx\csname natexlab\endcsname\relax\def\natexlab#1{#1}\fi
\expandafter\ifx\csname url\endcsname\relax
  \def\url#1{{\tt #1}}\fi

\bibitem[Balabanovic and Shoham(1995)]{MY}
M.~Balabanovic and Y.~Shoham.
\newblock Learning information retrieval agents: Experiments with automated web
  browsing.
\newblock In {\em Working Notes of AAAI Spring Symposium Series on Information
  Gathering from Distributed, Heterogeneous Environments}. AAAI-Press, 1995.

\bibitem[Datta(1997)]{PDatta}
P.~Datta.
\newblock {\em Characteristic Concept Representations}.
\newblock PhD thesis, University of California, Irvine, 1997.

\bibitem[Dumais et~al.(1998)Dumais, Platt, Heckerman, and Sahami]{DPHS}
S.T. Dumais, J.~Platt, D.~Heckerman, and M.~Sahami.
\newblock Inductive learning algorithms and representation for text
  categorization.
\newblock In {\em Proceedings of the seventh International Conference on
  Information and Knowledge Management (CIKM'98)}, pages 148--155, 1998.

\bibitem[G.W.~Cottrell and Zipser(1988)]{CMZ}
P.~Munro G.W.~Cottrell and D.~Zipser.
\newblock Image compression by back propagation: an example of extensional
  programming.
\newblock In N.E. Sharkey, editor, {\em Advances in Cognitive Science},
  volume~3. Ablex, 1988.

\bibitem[Japkowicz et~al.(1995)Japkowicz, Myers, and Gluck]{NCM}
N.~Japkowicz, C.~Myers, and M.~Gluck.
\newblock A novelty detection approach to classification.
\newblock In {\em Proceeding of the Fourteenth International Conference On
  Artificial Intelligence}, pages 518--523. Montreal, Canada, 1995.

\bibitem[Joachims(1996)]{TJO}
T.~Joachims.
\newblock A probabilistic analysis of the {R}occhio algorithm with {TF-IDF} for
  text categorization.
\newblock Technical report, School of Computer Science, Carnegie Mellon
  University, Pittsburgh, 1996.

\bibitem[Joachims(1998)]{TJ}
T.~Joachims.
\newblock Text categorization with support vector machines: Learning with many
  relevant features.
\newblock In {\em Proceeding 10 European Conference on Machine Learning
  (ECML)}, pages 137--142. Springer Verlag, 1998.
\newblock URL
  \url{http://www-ai.cs.uni-dortmund.de/DOKIMENTE/Joachims\_97a.sp.gz}.

\bibitem[Lang(1995)]{KL}
K.~Lang.
\newblock News{W}eeder:{L}earning to filter news.
\newblock In {\em Twelfth International Conference on Machine Learning}, pages
  331--339. Lake Tahoe,CA, 1995.

\bibitem[Lewis(1997)]{RDL}
D.~Lewis.
\newblock Reuters-21578 text categorization test collection.
\newblock {\em http://www.research.att.com/\~{}lewis}, 1997.

\bibitem[Manevitz and Yousef(2001)]{ManevitzMalik1}
L.~Manevitz and M.~Yousef.
\newblock Document classification via neural networks trained exclusively with
  positive examples.
\newblock Technical report, Department of Computer Science, University of
  Haifa, Haifa, 2001.

\bibitem[Pazzani and Billsus(1997)]{MD}
M.~Pazzani and D.~Billsus.
\newblock Learning and revising user profiles: The identification of
  interesting web sites.
\newblock {\em Machine Learning}, 27:\penalty0 313--331, 1997.

\bibitem[Pazzani et~al.(1996)Pazzani, Muramatsu, and Billsus]{MMB}
M.~Pazzani, J.~Muramatsu, and D.~Billsus.
\newblock Syskill \& {W}ebert:{I}dentifying interesting web sites.
\newblock In {\em AAAI Conference 1996}, pages 54--61, 1996.

\bibitem[Sch{\"{o}}lkopf et~al.(1999)Sch{\"{o}}lkopf, Platt, J.Shawe-Taylor,
  Smola, and Williamson]{Scholkopf1}
B.~Sch{\"{o}}lkopf, J.C. Platt, J.Shawe-Taylor, A.J. Smola, and R.C.
  Williamson.
\newblock Estimating the support of a high-dimensional distribution.
\newblock Technical report, Microsoft Research,MSR-TR-99-87, 1999.

\bibitem[van Rijsbergen(1979)]{Rij}
C.J. van Rijsbergen.
\newblock {\em Information Retrieval}.
\newblock Butterworths, London, second edition, 1979.

\bibitem[Yang and Liu(1999)]{Yang99}
Yiming Yang and Xin Liu.
\newblock A re-examination of text categorization methods.
\newblock In Marti~A. Hearst, Fredric Gey, and Richard Tong, editors, {\em
  Proceedings of SIGIR-99, 22nd ACM International Conference on Research and
  Development in Information Retrieval}, pages 42--49, Berkeley, US, 1999. ACM
  Press, New York, US.
\newblock URL \url{http://www.cs.cmu.edu/~yiming/papers.yy/sigir99.ps}.

\end{thebibliography}
