Numerical approximation of Knudsen layer for the Euler-Poisson systemFréderique Charles, Nicolas Vauchelet, Christophe Besse, Thierry Goudon, Ingrid Lacroix–Violet, Jean-Paul Dudon and Laurent NavoretESAIM: Proc., 32 (2011) 177-194DOI: https://doi.org/10.1051/proc/2011020