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A Robust Three-Level Time Split High-Order Leapfrog Crank-Nicolson Scheme for Two-Dimensional Sobolev and Regularized Long Wave Equations Arising in Fluid Mechanics. Adv. Appl. Math. Mech. 2025, 17 (3), 956-988. https://doi.org/10.4208/aamm.OA-2022-0320.