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An Upwind Mixed Finite Element Method on Changing Meshes for Positive Semi-Definite Oil-Water Displacement of Darcy-Forchheimer Flow in Porous Media. Adv. Appl. Math. Mech. 2020, 12 (5), 1196-1223. https://doi.org/10.4208/aamm.OA-2019-0256.