Combinative Preconditioners of Modified Incomplete Cholesky Factorization and Sherman-Morrison-Woodbury Update for Self-Adjoint Elliptic Dirichlet-Periodic Boundary Value Problems. JCM. 2021;22(6):833-856. Accessed December 5, 2025. https://www.global-sci.com/index.php/JCM/article/view/11677