\nobibliography{refs}
\bibliographystyle{plainnat} 

\begin{slide}{References}
\scriptsize
\bi 
\item Text mining
	\bi
	\item RIPPER: \bibentry{cohen95r}
	\ei
\item FSS
	\bi
	\item \bibentry{hall03}
	\item \bibentry{kohavi97} 
	\item \bibentry{miller02}
	\ei
\item COCOMO
	\bi
	\item  \bibentry{boehm00b}
	\item  \bibentry{me06d}
	\ei
\item MDP
	\bi
	\item \bibentry{me07b}
	\ei
\item SEL
	\bi
	\item \bibentry{song06}
	\ei

\ei
\end{slide}
