Li, Jiayu Max Planck Institute for Mathematics in the Sciences, Max Planck Society;
Liu, Lei Max Planck Institute for Mathematics in the Sciences, Max Planck Society;
Li, J., & Liu, L. (2019). Partial regularity of harmonic maps from a Riemannian manifold into a Lorentzian manifold. Pacific journal of mathematics, 299(1), 33-52. doi:10.2140/pjm.2019.299.33.