\begin{thebibliography}{1}

\bibitem{AkiRi80}
{\sc K.~Aki and P.~G. Richards}, {\em Quantitative Seismology}, vol.~I, W. H.
  Freeman and Company, New York, 1980.

\bibitem{Cheng89}
{\sc D.~K. Cheng}, {\em Field and Wave Electromagnetics}, Addison--Wesley,
  Reading, MA, 2nd~ed., 1989.

\bibitem{JKPS94}
{\sc F.~B. Jensen, W.~A. Kuperman, M.~B. Porter, and H.~Schmidt}, {\em
  Computational Ocean Acoustics}, AIP Press, New York, 1994.

\bibitem{KaHov00}
{\sc I.~Karasalo and J.~Hovem}, {\em Transient bistatic scattering from buried
  objects}, in Experimental Acoustic Inversion Methods for Exploration of the
  Shallow Water Environment, A.~Caiti, J.-P. Hermand, S.~M. Jesus, and M.~B.
  Porter, eds., Kluwer Acad. Publ., Dordrecht, The Netherlands, 2000,
  pp.~161--176.

\bibitem{MorFe53}
{\sc P.~M. Morse and H.~Feshbach}, {\em Methods of Theoretical Physics},
  McGraw--Hill, New York, 1953.

\bibitem{VaLaVa91}
{\sc V.~V. Varadan, A.~Lakhtakia, and V.~K. Varadan}, eds., {\em Acoustic,
  Electromagnetic, and Elastic Wave Scattering}, vol.~1, Elsevier Science
  Publishers, Amsterdam, The Netherlands, 1991.

\end{thebibliography}