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Optimal Error Estimates of the Semi-Discrete Local Discontinuous Galerkin Method and Exponential Time Differencing Schemes for the Thin Film Epitaxy Problem Without Slope Selection. Adv. Appl. Math. Mech. 2023, 15 (3), 545-567. https://doi.org/10.4208/aamm.OA-2021-0204.