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\frametitle{References}
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\begin{itemize}
\item  Milton Abramowitz and Irene A. Stegun {\em Handbook of Mathematical Functions} 1964: National Bureau of Standards.

\item  G. N. Watson {\em A Treatise on the Theory of Bessel Functions, 2nd. ed} 1966: Cambridge University Press.

\item  Marcus J. Grote and Joseph B. Keller ``On Nonreflecting Boundary Conditions" {\em Journal of Computational Physics}, 122, 231 - 243, 1995.

\item F. W. J. Olver, {\em The Asymptotic Expansion of Bessel Functions of Large Order}, Phil. Trans. Roy. Soc. Lond. A 247 (1954) 328-368.
\item P. K. Chattopadhyay, {\em Mathematical Physics}, 1990: New Age International (P) Limited, Publishers.

\end{itemize}
\end{frame}