“…Several other relaxation approximation have been introduced recently. For example we mentioned here the work of Coquel and Perthame [10] for real gas computation, the relaxation schemes of Jin et al [19] for curvaturedependent front propagation, the relaxation approximation in the rapid granular flow [22], the relaxation approximation and relaxation schemes for diffusion and convection-diffusion problems [21,25,27,28]. Moreover, there are strong and interesting links between the relaxation approximation and the kinetic approach to nonlinear transport equations, based upon analogies with the passage from the Boltzmann equation to fluid mechanics (see for example [1,2,7]).…”