Orthogonality relations of Crouzeix-Raviart and Raviart-Thomas finite element spaces. - Sören Bartels; Zhangxian Wang (Numerische Mathematik, 2021)

Error analysis for the numerical approximation of the harmonic map heat flow with nodal constraints. - Sören Bartels; Balázs Kovács; Zhangxian Wang (CoRR, 2022)

Quasi-optimal error estimates for the approximation of stable harmonic maps. - Sören Bartels; Christian Palus; Zhangxian Wang (CoRR, 2022)

Quasi-Optimal Error Estimates for the Finite Element Approximation of Stable Harmonic Maps with Nodal Constraints. - Sören Bartels; Christian Palus; Zhangxian Wang (SIAM J. Numer. Anal., 2023)