\begin{thebibliography}{Lou02}

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Carlo Ghezzi and Mehdi Jazayeri.
\newblock {\em Programming Language Concepts}.
\newblock John Wiley \& Sons, $3^{rd}$ edition, 1997.

\bibitem[Lou02]{Loud1}
Kennenth~C. Louden.
\newblock {\em Programming Languages: Principles and Practice}.
\newblock Brooks/Cole, 2002.

\end{thebibliography}
