\newpage

\begin{thebibliography}{99}

\bibitem{snns}{ \textsl{SNNS User Manual}, downloadable from the University of
	Stuttgart at:\\
	\small
	http://inf.informatik.uni-stuttgart.de:80/ipvr/bv/projekte/snns/snns.html
}

\bibitem{sopena}{\textsl{Neural Networks with Periodic and 
	Monotonic Activation Function: a Comparative Study in Classification Problems} 
	by Josep M. Sopena, Enrique Romero and Ren\'e Alque\'zar
}

\bibitem{lorenzo}{\textsl{Learning and Approximation Capabilities of Adaptive Spline 
	Activation Function Neural Networks} (1998) 
	by Lorenzo Vecci, Francesco Piazza and Aurelio Uncini.\\
	Downloadable from: \small http://www.elsevier.com/inca/tree/
}

\end{thebibliography}
