Simulations of kinetic electrostatic electron nonlinear (KEEN) waves with variable velocity resolution grids and high-order time-splittingBedros Afeyan, Fernando Casas, Nicolas Crouseilles, Adila Dodhy, Erwan Faou, Michel Mehrenberger and Eric SonnendrückerEur. Phys. J. D, 68 10 (2014) 295DOI: https://doi.org/10.1140/epjd/e2014-50212-6