On block triangular preconditioned iteration methods for solving the Helmholtz equation - Lang, Chao; Gao, Rong; Qiu, Chujun (Applied mathematics and computation, 2020)
Keywords: Block triangular preconditioning; Block two-by-two matrix; Helmholtz equation; Incomplete factorization; Block two-by-two matrix; Helmholtz equation; Incomplete factorization; Block triangular preconditioning