\ifx\undefined\bysame
\newcommand{\bysame}{\leavevmode\hbox to3em{\hrulefill}\,}
\fi
\begin{thebibliography}{1}

\bibitem{b}
Herk, Krogh, and Palmer, {\em Introduction to the theory of neural networks},
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\bibitem{e}
Kurkov\'a, {\em Aproximace funkci\'i {N}{S}}, Praha, 1999.

\bibitem{c}
Kvasni\v{c}ka and kolekt\'iv, {\em \'uvod do te\'orie {N}{S}}, {I}{R}{I}{S},
  Bratislava, 1997.

\bibitem{a}
Hassun M.H, {\em Fundamentals of artificial neural networks}, M{I}{T} {P}ress,
  Cambidge, 1995.

\bibitem{d}
\v{S}ima and {N}eruda, {\em Teoretick\'e ot\'azky {N}{S}}, Matfyz press, Praha,
  1996.

\end{thebibliography}