\begin{thebibliography}{1}

\bibitem{sira95}
H.~Sira-{R}am{\'{\i}}rez and E.~Colina-{M}orles.
\newblock A sliding mode strategy for adaptive learning in adalines.
\newblock {\em IEEE Transactions on Circuits and Systems---I: Fundamental
  Theory and Applications}, 42(12):1001--1012, December 1995.

\end{thebibliography}
