[1]  Liang, Qigang; Xu, Xuejun; Zhang, Shangyou  On a sharp estimate of overlapping Schwarz methods in H(curl;Ω) and H(div;Ω). IMA J. Numer. Anal.45 (2025), no. 2,1009–1027.

[2]  Liang, Qigang; Wang, Wei; Xu, Xuejun  A two-level block preconditioned Jacobi-Davidson method for multiple and clustered eigenvalues of elliptic operators. SIAM J. Numer. Anal. 62 (2024), no. 2, 998–1019.

[3]  Liang, Qigang; Xu, Xuejun  A two-level preconditioned Helmholtz subspace iterative method for Maxwell eigenvalue problems. SIAM J. Numer. Anal. 61 (2023), no. 2, 642–674.

[4]  Liang, Qigang; Xu, Xuejun; Yuan, Liuyao  A weak Galerkin finite element method can compute both upper and lower eigenvalue bounds. J. Sci. Comput. 93 (2022), no. 1, Paper No. 19, 21 pp.

[5]  Liang, Qigang; Xu, Xuejun  A two-level preconditioned Helmholtz-Jacobi-Davidson method for the Maxwell eigenvalue problem. Math. Comp. 91 (2022), no. 334, 623–657.