“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, no. 5 (September 28, 2025): 1118–1140. Accessed December 5, 2025. https://www.global-sci.com/index.php/JCM/article/view/22795.