$ℓ^1$-Error Estimates on the Hamiltonian-Preserving Scheme for the Liouville Equation with Piecewise Constant Potentials: A Simple Proof. JCM [Internet]. 2021 Jul. 1 [cited 2025 Dec. 5];35(6):814-27. Available from: https://www.global-sci.com/index.php/JCM/article/view/12297