A variational sheath model for stationary gyrokinetic Vlasov–Poisson equations Mehdi Badsi, Martin Campos-Pinto, Bruno Després and Ludovic Godard-Cadillac ESAIM: M2AN, 55 6 (2021) 2609-2642 Published online: 11 November 2021 DOI: 10.1051/m2an/2021067