\begin{thebibliography}{10}

\bibitem{mil_train1}
Smith, R.:
\newblock Essential {T}echinques for {M}ilitary {M}odeling and {S}imulation.
\newblock Volume~1 of Simulation Conference Proceedings. (1998)  805--812

\bibitem{mil_train2}
Walton, G.H., Patton, R.M., Parsons, D.J.:
\newblock Usage {T}esting of {M}ilitary {S}imulation {S}ystems.
\newblock Winter Simulation Conference (2001)  771--779

\bibitem{mil_train3}
Service, D.M.F.P.:
\newblock Former {P}{O}{W} learns value of military training.
\newblock TRADOC News Service (2003)

\bibitem{mil_train4}
Leu, M.C., Hilgers, M.G., Agarwal, S., Hall, R.H., Lambert, T., Albright, R.,
  Nebel, K.:
\newblock Training in {V}irtual {E}nvironments for {F}irst {R}esponders.
\newblock ASEE Midwest Section Meeting (2003)

\bibitem{dem_def}
geo Community:
\newblock {U}{S}{G}{S} {S}{D}{T}{S} format {D}igital {E}levation {M}odel data
  ({D}{E}{M}).
\newblock \url{http://www.dofactory.com/Patterns/Patterns.aspx} (Accessed June
  13. 2005)

\bibitem{gis_layer_def}
Meuser, M.R.:
\newblock What is {G}{I}{S} and {H}ow {D}oes it {W}ork?
\newblock \url{http://www.dofactory.com/Patterns/Patterns.aspx} (Accessed June
  13. 2005)

\bibitem{arcgis}
ESRI:
\newblock Arc{G}{I}{S}.
\newblock \url{http://www.esri.com/software/arcgis/} (Accessed June 13. 2005)

\bibitem{bil_format}
Softwright:
\newblock Topo{S}cript .{B}{I}{L} {F}ile {F}ormat.
\newblock
  \url{http://www.softwright.com/faq/support/toposcript_bil_file_format.html}
  (Accessed April 2. 2005)

\bibitem{shp_format}
E{S}{R}{I}:
\newblock {E}{S}{R}{I} {S}hapefile {T}echnical {D}escription.
\newblock \url{http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf}
  (Accessed March 17. 2005)

\bibitem{opengl}
Board, O.A.R.:
\newblock Open{G}{L} - {T}he {I}ndustry {S}tandard for {H}igh {P}erformance
  {G}raphics.
\newblock \url{http://www.opengl.org/} (Accessed June 13. 2005)

\bibitem{direct3d}
{C}orporation, M.:
\newblock Microsoft {D}irect{X}: {H}ome {P}age.
\newblock \url{http://www.microsoft.com/windows/directx/default.aspx} (Accessed
  June 13. 2005)

\bibitem{tri_dec1}
Schroeder, W.J., Zarge, J.A., Lorensen, W.E.:
\newblock Decimation of {T}riangle {M}eshes.
\newblock ACM SIGGRAPH (1992)  65--70

\bibitem{tri_dec2}
Schroeder, W.J.:
\newblock A {T}opology {M}odifying {P}rogressive {D}ecimation {A}lgorithm.
\newblock IEEE Visualization (1997)  205--212

\bibitem{mesh_dec1}
Kobbelt, L., Campagna, S., Seidel, H.:
\newblock A {G}eneral {F}ramework for {M}esh {D}ecimation.
\newblock Graphics {I}nterface {C}onference (1998)

\bibitem{mesh_dec2}
Schaufler, G., Sturzlinger, W.:
\newblock Generating {M}ultiple {L}evels of {D}etail from {P}olygonal
  {G}eometry {M}odels.
\newblock Virtual Environments \'95 (1995)  33--41

\bibitem{mesh_dec3}
Algorri, M.E., Frances-Schmitt:
\newblock Mesh {S}implification.
\newblock Volume~15 of Computer Graphics Forum. (1996) ~77

\bibitem{ear_clip_and_trap}
O'Rourke, J.:
\newblock Computational {G}eometry in {C}. 2 edn.
\newblock Cambridge {U}niversity {P}ress (1998)

\bibitem{mon_decomp}
de~Berg, M., van Kreveld, M., Overmars, M., Shcwarzkopf, O.:
\newblock Computational {G}eometry - {A}lgorithms and {A}pplications. 2 edn.
\newblock Springer (1998)

\end{thebibliography}