On block triangular preconditioned iteration methods for solving the Helmholtz equation. - Chao Lang; Rong Gao; Chujun Qiu (Appl. Math. Comput., 2020)

Dispersion-dissipation analysis of triangular numerical-flux-based discontinuous Galerkin method for elastic wave equations. - Xijun He; Dinghui Yang; Chujun Qiu (J. Comput. Phys., 2020)