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2025. Sharp Error Estimate of Variable Time-Step Imex BDF2 Scheme for Parabolic Integro-Differential Equations with Initial Singularity Arising in Finance. Journal of Computational Mathematics. 43, 5 (Sep. 2025), 1118–1140. DOI:https://doi.org/10.4208/jcm.2406-m2023-0095.