Verification of 2D × 2D and Two-Species Vlasov-Poisson Solvers, Yann Barsamian, Joackim Bernier, Sever A. Hirstoaga and Michel Mehrenberger ESAIM: ProcS, 63 (2018) 78-108 Published online: 19 October 2018 DOI: 10.1051/proc/201863078