\relax 
\bibstyle{plainnat}
\citation{BosGuyVap92}
\citation{SchBurSmo98}
\citation{SmoBarSchSch99}
\bibdata{preface}
\bibcite{BosGuyVap92}{{1}{1992}{{Boser et~al.}}{{Boser, Guyon, and Vapnik}}}
\bibcite{SchBurSmo98}{{2}{1999}{{{Sch\"olkopf} et~al.}}{{{Sch\"olkopf}, Burges, and Smola}}}
\bibcite{SmoBarSchSch99}{{3}{2000}{{Smola et~al.}}{{Smola, Bartlett, {Sch\"olkopf}, and Schuurmans}}}