Cooper, J. (1998), *Introduction to Partial Differential Equations with MATLAB,* Boston: Birkhauser.

Eck, D. (2001), *Java Components for Mathematics*, http://math.hws.edu/javamath/ (accessed June 17, 2004).

Jungel, A.(2002), Modeling and Numerical Approximation of Traffic Flow Problems, http://www.numerik.mathematik.uni-mainz.de/~juengel/scripts/trafficflow.pdf (accessed June 17, 2004).

Knobel, R. (2000) *An Introduction to the Mathematical Theory of Waves,* AMS Student Mathematical Library, Providence: American Mathematical Society.

Lehn, M., and R. Scherer (undated), *Modeling of Flow and Pollution for the River Struma*, http://www.mathematik.uni-karlsruhe.de/~ipm/waterman/num_modeling.html (accessed June 17, 2004).

Roychoudhury, A. (undated), *Transport Processes*, http://web.uct.ac.za/depts/geolsci/people/staff/roy/lectures/lec13.pdf (accessed June 17, 2004).

Sarra, S. (2003), "The Method of Characteristics with Applications to Conservation Laws," *Journal of Online Mathematics and its Applications*, Vol. 3, http://www.joma.org/mathDL/4/?pa=content&sa=viewDocument&nodeId=389 (accessed September 7, 2004).

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