\begin{itemize}

\item[~1.]
R.~Courant and K.~O.~Friedrichs.
``Supersonic Flow and Shock Waves'' Interscience 

\hspace{5mm} Publishers, New York, 1969.

\item[~2.]
A.~N.~Cox, R.~G.~Deupree, and M.~Gehmeyr.
{\it Physica D},
	  {\bf 60}, p.~139, 1992.

\item[~3.]
E.~A.~Dorfi and L.~O'C.~Drury.
{\it Journal of Computational Physics},
	  {\bf 69}, p.~175, 1987.

\item[~4.]
L. Ensman. 
{\it Ph. D. Thesis}, University of California at Santa Cruz, 1991.

\item[~5.]
L.~G.~Henyey, J.~E.~Forbes and N.~L.~Gould. 
{\it The Astrophysical Journal}, {\bf 139}, p.~306, 

\hspace{5mm} 1964.

\item[~6.] 
L.~D.~Landau and E.~M.~Lifshitz. 
``Fluid Mechanics''
            Pergamon Press, Oxford, 1987.
\item[~7.]
D.~Mihalas and B.~W.~Mihalas.
``Foundations of Radiation Hydrodynamics'' Oxford 

\hspace{5mm} University Press, Oxford, 1984.

\item[~8.] 
W.~A.~Mulder and B. van Leer.
{\it Journal of Computational Physics},
             {\bf 59}, p.~232, 1985.

\item[~9.]
W.~F.~Noh.
{\it Journal of Computational Physics},
            {\bf 72}, p.~78, 1987.

\item[10.]
G.~A.~Sod. 
{\it Journal of Computational Physics},
            {\bf 27}, p.~1, 1978.

\item[11.]
W.~M.~Tscharnuter and K.-H.~A.~Winkler.
{\it Comput. Phys. Commun.},
            {\bf 18}, p.~171, 1979.

\item[12.]
K.-H.~A.~Winkler and M.~L.~Norman.
{\it In:} ``Astrophysical Radiation Hydrodynamics" (K.-H.A.~Winkler 
	  and M.N.~Norman, eds.),
	  p.~71, D. Reidel Publisher, Dordrecht, 1986.

\item[13.]
K.-H.~A.~Winkler, M.~L.~Norman, and D.~Mihalas.
{\it Journal of Quantitative Spectroscopy 

\hspace{5mm} and Radiative Transfer}
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\item[14.]
P.~R.~Woodward and P.~Collela.
{\it Journal of Computational Physics},
           {\bf 54}, p.~115, 1983.

\item[15.]
Ya.~B.~Zel'dovich and Yu.~P.~Raizer.
``Physics of Shock Waves and High Temperature 

\hspace{5mm} Hydrodynamic Phenomena''
	  Academic Press, New York, 1966.

\end{itemize}
.
